diff -r 3abde7651c38 -r 14b40afccd69 controls/VariablePanel.py
--- a/controls/VariablePanel.py	Tue Oct 03 16:12:55 2017 +0300
+++ b/controls/VariablePanel.py	Tue Oct 03 16:31:31 2017 +0300
@@ -663,7 +663,6 @@
         def _RefreshButtons():
             if self:
                 table_length = len(self.Table.data)
-                row_class = None
                 row_edit = True
                 row = 0
                 if table_length > 0: