Merge pull request #594 from marynate/PR-fix-rdebug-crash

Fixed failed to connect to remote debugger with -rdebug will crash engine

core/script_language.h

@@ -246,7 +246,7 @@ public:
 	virtual void set_request_scene_tree_message_func(RequestSceneTreeMessageFunc p_func, void *p_udata) {}
 
 	ScriptDebugger();
-	virtual ~ScriptDebugger() {}
+	virtual ~ScriptDebugger() {singleton=NULL;}
 
 };