Optimizer, log errors

  • Log errors are popping up every time my site is accessed like this below:

    PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback, function ‘__return_empty_null’ not found or invalid function name in web/wp-includes/class-wp-hook.php on line 288

    Looking for information about this problem with WordPress administrators, I was informed that this is due to the lack of updating of the theme.

    How do I resolve and eliminate these log errors? can anybody help me?

    Thank you very much in advance.

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