PHP Warning After Update to 4.1

On line 49 of the-events-calendar/common/src/Tribe/Admin/Notice/Archive_Slug_Conflict.php, the plugin attempts to evaluate the $dimissed_notices variable with the in_array() function. However, there’s nothing in the code preceding that call that checks to see if $dimissed_notices is actually an array before using in_array().

In addition, this call seems to trigger any time anything within /wp-admin/ is invoked.

This is problematic when you have AJAX calls on the front-end of your site, because:
a) The wp_ajax_nopriv_{$action} call invokes something within /wp-admin/, which, in turn, triggers the maybe_add_admin_notice() function mentioned above.
b) The wp_ajax_nopriv_{$action} action is only called when the user is not logged in. Therefore, the get_user_meta() function (more appropriately, the get_metadata() function) uses a $user_id of 0, which returns false rather than an array.

Therefore, on the front-end, when you are not logged into the site, any AJAX call throws a PHP warning about in_array() expecting parameter 2 to be an array.

I would recommend the following checks:
1) Don’t run maybe_add_admin_notice() if this is an AJAX call
2) Test the $dismissed_notices variable to make sure it’s an array before using it in in_array()

Thanks.

https://wordpress.org/plugins/the-events-calendar/