Fix issue when deleting script with no evalValue result

src/Evaluator/Evaluator.cpp

@@ -22,6 +22,9 @@ void Evaluator::EvaluateBlockStatement(BoundBlockStatement* statement) {
 }
 
 void Evaluator::EvaluateExpressionStatement(BoundExpressionStatement *statement) {
+    // Delete previously saved value.
+    delete this->_scriptData->_lastValue;
+    // Save new value
     this->_scriptData->_lastValue = this -> EvaluateExpression(statement->GetExpression());
 }
 

src/Evaluator/Evaluator.hpp

@@ -30,6 +30,7 @@ class Evaluator {
 public:
     Evaluator(Script* script){
         _scriptData = script;
+        _result = nullptr;
     }
     void Evaluate(BoundScriptStatement* statement);