Thanks for informing us about your update, but how does this code even run? $co->hexdigest should either not be compiling, or be dieing with "Can't call method "hexdigest" on an undefined value" or "Can't locate object method "hexdigest" via package ...".
Update: Please see Short, Self-Contained, Correct Example. Unfortunately, we can't diagnose the issues you might be having with your code if you don't provide something representative that we can run, and especially not if the code you post suffers from issues that don't even exist in the original code. Also made second sentence more accurate.
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