--- a/LPCManager.py	Wed Feb 27 13:04:36 2013 +0100
+++ b/LPCManager.py	Wed Mar 13 12:04:18 2013 +0900
@@ -605,7 +605,7 @@
                             ("CanOpenSlave", LPCCanOpenSlave, "CanOpen Slave")]
         
         def GetCanDriver(self):
-            return ""
+            return None
         
         def LoadChildren(self):
             ConfigTreeNode.LoadChildren(self)