--- a/DebugClients/Python3/DebugClientBase.py	Sat Sep 24 18:00:30 2016 +0200
+++ b/DebugClients/Python3/DebugClientBase.py	Fri Sep 30 19:21:22 2016 +0200
@@ -374,6 +374,8 @@
                 filename = excval.filename
                 linenr = excval.lineno
                 charnr = excval.offset
+                if charno is None:
+                    charno = 0
             except (AttributeError, ValueError):
                 exclist = []
             else: