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What
On at least some post comments, a PHP error is being printed to the front end.
Why
We're using the
get_avatar
hook, who's third parameter$id_or_email
, is specified atA user ID, email address, or comment object.
We are only accommodating for a user ID or email address, and do not have code to accept a comment object.
Reference: https://codex.wordpress.org/Plugin_API/Filter_Reference/get_avatar
The Fix
I've updated the offending function using the example from the codex page to also accept comment objects