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--- a/Allura/allura/command/taskd.py
+++ b/Allura/allura/command/taskd.py
@@ -86,7 +86,7 @@
                 if self.keep_running:
                     return func()
                 else:
-                    return None
+                    raise StopIteration
             return waitfunc_checks_running
 
         if pylons.g.amq_conn: