Handling for when userdata is not defined yet, but might be defined later

src/Parser/Parser.cpp

@@ -29,6 +29,8 @@ namespace Porygon::Parser {
 
     inline const Token *Parser::Next() {
         this->_position++;
+        if (_position > _tokens.size())
+            return nullptr;
         return this->_tokens[_position - 1];
     }
 
@@ -183,11 +185,14 @@ namespace Porygon::Parser {
         auto block = this->ParseBlock({TokenKind::EndKeyword});
 
         auto start = current->GetStartPosition();
+        auto end = block->GetEndPosition();
         if (hasErrors) {
-            return new ParsedBadStatement(start, block->GetEndPosition() - start);
+            delete block;
+            return new ParsedBadStatement(start,  end - start);
         }
         if (block->GetKind() == ParsedStatementKind::Bad) {
-            return new ParsedBadStatement(start, block->GetEndPosition() - start);
+            delete block;
+            return new ParsedBadStatement(start, end - start);
         }
         auto functionIdentifier = dynamic_cast<const IdentifierToken*>(functionIdentifierToken)->GetValue();
         return new ParsedFunctionDeclarationStatement(HashedString(functionIdentifier), parameters,