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I use User Events as the transport mechanism between asynchronous processes. As a result I wish there were a feature where there was an event generated when a reference goes invalid. I made an Idea on the Idea Exchange here. Similarly the work around is to have a timeout where the reference is checked to be invalid. A better solution is to send a stop command as some kind of global user event, or in your case enqueue. But as you've seen there can be edge cases where things stop unexpectedly and I just want all the running children to go through their cleanup process. Stopping on the error, or invalid user event reference, is a fairly simple way to do that.