Thank you for your feedback h.tobisch. That is interesting, good to know that the platform enforces that behavior. Adding the isnull() check would certainly cover other failures, and may be necessary for some procedures. My intention with the try catch is that other failures would raise errors which would be handled in the catch clause. The query timeout always results with NULL as the return code, so we are raising an error based on that specific condition.

-Chad Feghali