--- a/plcopen/plcopen.py	Fri Oct 05 18:11:51 2007 +0200
+++ b/plcopen/plcopen.py	Wed Oct 17 17:50:27 2007 +0200
@@ -1090,6 +1090,8 @@
         for action in self.action:
             params = {}
             params["qualifier"] = action.getQualifierValue()
+            if params["qualifier"] is None:
+                params["qualifier"] = "N"
             if action.getReference():
                 params["type"] = "reference"
                 params["value"] = action.getReferenceName()