diff --git a/src/ObjLoading/Game/IW4/Menu/MenuConverterIW4.cpp b/src/ObjLoading/Game/IW4/Menu/MenuConverterIW4.cpp
index 2914194f..ecd91299 100644
--- a/src/ObjLoading/Game/IW4/Menu/MenuConverterIW4.cpp
+++ b/src/ObjLoading/Game/IW4/Menu/MenuConverterIW4.cpp
@@ -751,7 +751,8 @@ namespace IW4
                         continue;
                     }
 
-                    assert(false);
+                    // Do not consider this a mistake since the games menus do this by mistake and it should be able to compile them anyway
+                    // But the game should also not know what to do with this i guess
                     expressionIsStatic = false;
                 }
 
diff --git a/src/ObjLoading/Game/IW5/Menu/MenuConverterIW5.cpp b/src/ObjLoading/Game/IW5/Menu/MenuConverterIW5.cpp
index 1a2ff51d..3da84150 100644
--- a/src/ObjLoading/Game/IW5/Menu/MenuConverterIW5.cpp
+++ b/src/ObjLoading/Game/IW5/Menu/MenuConverterIW5.cpp
@@ -753,7 +753,8 @@ namespace IW5
                         continue;
                     }
 
-                    assert(false);
+                    // Do not consider this a mistake since the games menus do this by mistake and it should be able to compile them anyway
+                    // But the game should also not know what to do with this i guess
                     expressionIsStatic = false;
                 }
 
diff --git a/src/ObjLoading/Parsing/Menu/MenuFileCommonOperations.cpp b/src/ObjLoading/Parsing/Menu/MenuFileCommonOperations.cpp
new file mode 100644
index 00000000..48abf663
--- /dev/null
+++ b/src/ObjLoading/Parsing/Menu/MenuFileCommonOperations.cpp
@@ -0,0 +1,27 @@
+#include "MenuFileCommonOperations.h"
+
+#include "Parsing/ParsingException.h"
+
+using namespace menu;
+
+void MenuFileCommonOperations::EnsureIsNumericExpression(const MenuFileParserState* state, const TokenPos& pos, const ISimpleExpression& expression)
+{
+    if (!state->m_permissive_mode && expression.IsStatic())
+    {
+        const auto staticValue = expression.EvaluateStatic();
+
+        if (staticValue.m_type != SimpleExpressionValue::Type::INT && staticValue.m_type != SimpleExpressionValue::Type::DOUBLE)
+            throw ParsingException(pos, "Expression is expected to be numeric. Use permissive mode to compile anyway.");
+    }
+}
+
+void MenuFileCommonOperations::EnsureIsStringExpression(const MenuFileParserState* state, const TokenPos& pos, const ISimpleExpression& expression)
+{
+    if (!state->m_permissive_mode && expression.IsStatic())
+    {
+        const auto staticValue = expression.EvaluateStatic();
+
+        if (staticValue.m_type != SimpleExpressionValue::Type::STRING)
+            throw ParsingException(pos, "Expression is expected to be string. Use permissive mode to compile anyway.");
+    }
+}
\ No newline at end of file
diff --git a/src/ObjLoading/Parsing/Menu/MenuFileCommonOperations.h b/src/ObjLoading/Parsing/Menu/MenuFileCommonOperations.h
new file mode 100644
index 00000000..b56c83b5
--- /dev/null
+++ b/src/ObjLoading/Parsing/Menu/MenuFileCommonOperations.h
@@ -0,0 +1,14 @@
+#pragma once
+#include "MenuFileParserState.h"
+#include "Parsing/TokenPos.h"
+#include "Parsing/Simple/Expression/ISimpleExpression.h"
+
+namespace menu
+{
+    class MenuFileCommonOperations
+    {
+    public:
+        static void EnsureIsNumericExpression(const MenuFileParserState* state, const TokenPos& pos, const ISimpleExpression& expression);
+        static void EnsureIsStringExpression(const MenuFileParserState* state, const TokenPos& pos, const ISimpleExpression& expression);
+    };
+}
diff --git a/src/ObjLoading/Parsing/Menu/Sequence/ItemScopeSequences.cpp b/src/ObjLoading/Parsing/Menu/Sequence/ItemScopeSequences.cpp
index 336b1182..cb94bf8c 100644
--- a/src/ObjLoading/Parsing/Menu/Sequence/ItemScopeSequences.cpp
+++ b/src/ObjLoading/Parsing/Menu/Sequence/ItemScopeSequences.cpp
@@ -10,6 +10,7 @@
 #include "Generic/GenericKeywordPropertySequence.h"
 #include "Generic/GenericMenuEventHandlerSetPropertySequence.h"
 #include "Generic/GenericStringPropertySequence.h"
+#include "Parsing/Menu/MenuFileCommonOperations.h"
 #include "Parsing/Menu/Matcher/MenuExpressionMatchers.h"
 #include "Parsing/Menu/Matcher/MenuMatcherFactory.h"
 
@@ -663,12 +664,14 @@ void ItemScopeSequences::AddSequences(FeatureLevel featureLevel, bool permissive
     {
         state->m_current_item->m_border_size = value;
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywordAndBool("visible", [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywordAndBool("visible", [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_item->m_visible_expression = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywordAndBool("disabled", [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywordAndBool("disabled", [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_item->m_disabled_expression = std::move(value);
     }));
     AddSequence(std::make_unique<GenericIntPropertySequence>("ownerdraw", [](const MenuFileParserState* state, const TokenPos&, const int value)
@@ -803,96 +806,114 @@ void ItemScopeSequences::AddSequences(FeatureLevel featureLevel, bool permissive
         state->m_current_item->m_game_message_window_mode = value;
     }));
     AddSequence(std::make_unique<SequenceDecodeEffect>());
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "disabled"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "disabled"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_item->m_disabled_expression = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "text"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "text"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsStringExpression(state, pos, *value);
         state->m_current_item->m_text_expression = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "material"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "material"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsStringExpression(state, pos, *value);
         state->m_current_item->m_material_expression = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "material"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
-    {
-        state->m_current_item->m_material_expression = std::move(value);
-    }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "rect", "X"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "rect", "X"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_item->m_rect_x_exp = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "rect", "Y"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "rect", "Y"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_item->m_rect_y_exp = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "rect", "W"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "rect", "W"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_item->m_rect_w_exp = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "rect", "H"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "rect", "H"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_item->m_rect_h_exp = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "forecolor", "R"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "forecolor", "R"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_item->m_forecolor_expressions.m_r_exp = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "forecolor", "G"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "forecolor", "G"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_item->m_forecolor_expressions.m_g_exp = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "forecolor", "B"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "forecolor", "B"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_item->m_forecolor_expressions.m_b_exp = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "forecolor", "A"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "forecolor", "A"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_item->m_forecolor_expressions.m_a_exp = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "forecolor", "RGB"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "forecolor", "RGB"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_item->m_forecolor_expressions.m_rgb_exp = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "glowcolor", "R"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "glowcolor", "R"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_item->m_glowcolor_expressions.m_r_exp = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "glowcolor", "G"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "glowcolor", "G"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_item->m_glowcolor_expressions.m_g_exp = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "glowcolor", "B"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "glowcolor", "B"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_item->m_glowcolor_expressions.m_b_exp = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "glowcolor", "A"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "glowcolor", "A"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_item->m_glowcolor_expressions.m_a_exp = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "glowcolor", "RGB"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "glowcolor", "RGB"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_item->m_glowcolor_expressions.m_rgb_exp = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "backcolor", "R"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "backcolor", "R"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_item->m_backcolor_expressions.m_r_exp = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "backcolor", "G"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "backcolor", "G"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_item->m_backcolor_expressions.m_g_exp = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "backcolor", "B"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "backcolor", "B"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_item->m_backcolor_expressions.m_b_exp = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "backcolor", "A"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "backcolor", "A"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_item->m_backcolor_expressions.m_a_exp = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "backcolor", "RGB"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "backcolor", "RGB"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_item->m_backcolor_expressions.m_rgb_exp = std::move(value);
     }));
 
@@ -901,8 +922,9 @@ void ItemScopeSequences::AddSequences(FeatureLevel featureLevel, bool permissive
         AddSequence(std::make_unique<GenericMenuEventHandlerSetPropertySequence>("hasFocus", [](const MenuFileParserState* state, const TokenPos&) -> std::unique_ptr<CommonEventHandlerSet>& {
             return state->m_current_item->m_has_focus;
         }));
-        AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "textaligny"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+        AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "textaligny"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
         {
+            MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
             state->m_current_item->m_text_align_y_expression = std::move(value);
         }));
     }
@@ -964,6 +986,7 @@ void ItemScopeSequences::AddSequences(FeatureLevel featureLevel, bool permissive
         AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "elementheight"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
         {
             ItemScopeOperations::EnsureHasListboxFeatures(*state->m_current_item, pos);
+            MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
             state->m_current_item->m_list_box_features->m_element_height_expression = std::move(value);
         }));
     }
diff --git a/src/ObjLoading/Parsing/Menu/Sequence/MenuScopeSequences.cpp b/src/ObjLoading/Parsing/Menu/Sequence/MenuScopeSequences.cpp
index 22a6a20e..cbfbbed6 100644
--- a/src/ObjLoading/Parsing/Menu/Sequence/MenuScopeSequences.cpp
+++ b/src/ObjLoading/Parsing/Menu/Sequence/MenuScopeSequences.cpp
@@ -10,6 +10,7 @@
 #include "Generic/GenericKeywordPropertySequence.h"
 #include "Generic/GenericMenuEventHandlerSetPropertySequence.h"
 #include "Generic/GenericStringPropertySequence.h"
+#include "Parsing/Menu/MenuFileCommonOperations.h"
 #include "Parsing/Menu/Matcher/MenuMatcherFactory.h"
 #include "Parsing/Menu/Domain/CommonMenuTypes.h"
 #include "Parsing/Menu/Matcher/MenuExpressionMatchers.h"
@@ -254,8 +255,9 @@ void MenuScopeSequences::AddSequences(FeatureLevel featureLevel, bool permissive
     {
         state->m_current_menu->m_style = value;
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywordAndBool("visible", [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywordAndBool("visible", [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_menu->m_visible_expression = std::move(value);
     }));
     AddSequence(std::make_unique<GenericMenuEventHandlerSetPropertySequence>("onOpen", [](const MenuFileParserState* state, const TokenPos&) -> std::unique_ptr<CommonEventHandlerSet>& {
@@ -318,28 +320,34 @@ void MenuScopeSequences::AddSequences(FeatureLevel featureLevel, bool permissive
     {
         state->m_current_menu->m_sound_loop = value;
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "rect", "X"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "rect", "X"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_menu->m_rect_x_exp = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "rect", "Y"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "rect", "Y"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_menu->m_rect_y_exp = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "rect", "W"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "rect", "W"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_menu->m_rect_w_exp = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "rect", "H"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "rect", "H"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsNumericExpression(state, pos, *value);
         state->m_current_menu->m_rect_h_exp = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "openSound"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "openSound"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsStringExpression(state, pos, *value);
         state->m_current_menu->m_open_sound_exp = std::move(value);
     }));
-    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "closeSound"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+    AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "closeSound"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
     {
+        MenuFileCommonOperations::EnsureIsStringExpression(state, pos, *value);
         state->m_current_menu->m_close_sound_exp = std::move(value);
     }));
     AddSequence(std::make_unique<GenericKeywordPropertySequence>("popup", [](const MenuFileParserState* state, const TokenPos&)
@@ -396,8 +404,9 @@ void MenuScopeSequences::AddSequences(FeatureLevel featureLevel, bool permissive
 
     if (featureLevel == FeatureLevel::IW5)
     {
-        AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "soundLoop"}, [](const MenuFileParserState* state, const TokenPos&, std::unique_ptr<ISimpleExpression> value)
+        AddSequence(GenericExpressionPropertySequence::WithKeywords({"exp", "soundLoop"}, [](const MenuFileParserState* state, const TokenPos& pos, std::unique_ptr<ISimpleExpression> value)
         {
+            MenuFileCommonOperations::EnsureIsStringExpression(state, pos, *value);
             state->m_current_menu->m_sound_loop_exp = std::move(value);
         }));
         AddSequence(std::make_unique<GenericMenuEventHandlerSetPropertySequence>("onFocusDueToClose", [](const MenuFileParserState* state, const TokenPos&) -> std::unique_ptr<CommonEventHandlerSet>& {