diff -r 80f05b17de1e -r f8cecd8eb32e plugger.py
--- a/plugger.py	Wed Dec 16 15:21:17 2009 +0100
+++ b/plugger.py	Tue Jun 01 10:03:58 2010 +0200
@@ -1262,7 +1262,7 @@
         """
         self._ProgramList = None
         self._VariablesList = None
-        self._IECPathToIdx = None
+        self._IECPathToIdx = {}
         self.TracedIECPath = []
 
     def GetIECProgramsAndVariables(self):