--- a/controls/PouInstanceVariablesPanel.py	Fri Oct 28 18:59:04 2022 +0800
+++ b/controls/PouInstanceVariablesPanel.py	Fri Oct 28 19:39:17 2022 +0800
@@ -217,10 +217,6 @@
         self.FilterCaseSensitive = False
         self.FilterWholeWord = False
 
-
-    def __del__(self):
-        self.Controller = None
-
     def SetTreeImageList(self, tree_image_list):
         self.VariablesList.SetImageList(tree_image_list)