diff --git a/src/Parser/Parsing/Impl/AbstractLexer.h b/src/Parser/Parsing/Impl/AbstractLexer.h
index 27ab1298..abd830b6 100644
--- a/src/Parser/Parsing/Impl/AbstractLexer.h
+++ b/src/Parser/Parsing/Impl/AbstractLexer.h
@@ -263,7 +263,9 @@ protected:
     {
         const auto& currentLine = CurrentLine();
         assert(m_current_line_offset >= 1);
-        assert(isdigit(currentLine.m_line[m_current_line_offset - 1]) || currentLine.m_line[m_current_line_offset - 1] == '.');
+        assert(isdigit(currentLine.m_line[m_current_line_offset - 1])
+            || currentLine.m_line[m_current_line_offset - 1] == '.'
+            || currentLine.m_line[m_current_line_offset - 1] == '-');
 
         const auto lineLength = currentLine.m_line.size();
         if (lineLength - m_current_line_offset >= 1
diff --git a/src/Parser/Parsing/Impl/AbstractParser.h b/src/Parser/Parsing/Impl/AbstractParser.h
index 37430bcf..4fde10ce 100644
--- a/src/Parser/Parsing/Impl/AbstractParser.h
+++ b/src/Parser/Parsing/Impl/AbstractParser.h
@@ -30,7 +30,7 @@ protected:
     virtual const std::vector<sequence_t*>& GetTestsForState() = 0;
 
 public:
-    virtual ~AbstractParser() override = default;
+    ~AbstractParser() override = default;
     AbstractParser(const AbstractParser& other) = default;
     AbstractParser(AbstractParser&& other) noexcept = default;
     AbstractParser& operator=(const AbstractParser& other) = default;
diff --git a/src/Parser/Parsing/Simple/SimpleLexer.cpp b/src/Parser/Parsing/Simple/SimpleLexer.cpp
index f643b55c..e95b098b 100644
--- a/src/Parser/Parsing/Simple/SimpleLexer.cpp
+++ b/src/Parser/Parsing/Simple/SimpleLexer.cpp
@@ -120,7 +120,7 @@ SimpleParserValue SimpleLexer::GetNextToken()
     if (m_config.m_read_strings && c == '\"')
         return SimpleParserValue::String(pos, new std::string(ReadString()));
 
-    if (m_config.m_read_numbers && (isdigit(c) || c == '.' && isdigit(PeekChar())))
+    if (m_config.m_read_numbers && (isdigit(c) || (c == '-' || c == '.') && isdigit(PeekChar())))
     {
         bool isFloatingPointValue;
         double doubleValue;