diff -r 80b225e9a6b6 -r 7373e3048167 controls/DebugVariablePanel/DebugVariableViewer.py
--- a/controls/DebugVariablePanel/DebugVariableViewer.py	Fri Oct 12 11:50:40 2018 +0300
+++ b/controls/DebugVariablePanel/DebugVariableViewer.py	Fri Oct 12 12:06:45 2018 +0300
@@ -26,6 +26,7 @@
 from __future__ import absolute_import
 from __future__ import division
 from collections import OrderedDict
+from functools import reduce
 
 import wx
 from matplotlib.backends.backend_wxagg import _convert_agg_to_wx_bitmap