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On some websites, a warning appears constantly in the php-log:
PHP Warning: array_filter() expects parameter 1 to be array, string given in wp-content/plugins/all-in-one-seo-pack/app/Common/Meta/Robots.php on line 185
PHP Warning: implode(): Invalid arguments passed in wp-content/plugins/all-in-one-seo-pack/app/Common/Meta/Robots.php on line 187
What to do with it?