Index: roundup/cgi/client.py
===================================================================
--- roundup/cgi/client.py	(revision 4472)
+++ roundup/cgi/client.py	(working copy)
@@ -1117,7 +1117,7 @@
         if ':action' in self.form:
             action = self.form[':action'].value.lower()
         elif '@action' in self.form:
-            action = self.form['@action'].value.lower()
+            action = self.form.getfirst('@action').lower()
         else:
             return None