I noticed after upgrading to the latest version of WP, 4.7.1, that I now have a warning at the top of the page for one of my sites. The message is: "Warning: call_user_func_array() expects parameter 1 to be a valid callback, no array or string given in /home/ciportnechestx/public_html/wp-includes/class-wp-hook.php on line 298"
Has anyone seen this issue before before? I have other websites that use the same theme version (v3.7.24) and WP v4.7.1 without this issue. I'm still in the process of troubleshooting plugin compatibility issues but all the plugins are fairly well used between the different sites as well.
Thanks in advance.