--- a/PLCGenerator.py	Wed Dec 16 15:20:56 2009 +0100
+++ b/PLCGenerator.py	Tue Jun 01 12:41:14 2010 +0200
@@ -926,6 +926,8 @@
         elif type(paths) == ListType:
             vars = [self.ComputePaths(path) for path in paths]
             return JoinList([(" AND ", ())], vars)
+        elif paths is None:
+            return [("TRUE", ())]
         else:
             return eval(paths)
 
@@ -990,7 +992,7 @@
         instances = []
         for connectionPointIn in convergence.getconnectionPointIn():
             connections = connectionPointIn.getconnections()
-            if len(connections) == 1:
+            if connections is not None and len(connections) == 1:
                 instanceLocalId = connections[0].getrefLocalId()
                 body = pou.getbody()
                 if isinstance(body, ListType):
@@ -1010,7 +1012,7 @@
             if step.connectionPointIn:
                 instances = []
                 connections = step.connectionPointIn.getconnections()
-                if len(connections) == 1:
+                if connections is not None and len(connections) == 1:
                     instanceLocalId = connections[0].getrefLocalId()
                     body = pou.getbody()
                     if isinstance(body, ListType):
@@ -1039,7 +1041,7 @@
         if jump.connectionPointIn:
             instances = []
             connections = jump.connectionPointIn.getconnections()
-            if len(connections) == 1:
+            if connections is not None and len(connections) == 1:
                 instanceLocalId = connections[0].getrefLocalId()
                 body = pou.getbody()
                 if isinstance(body, ListType):