Wordpress: Call to undefined function error after adding add_filter to wp-config (3 Solutions!!)

Wordpress: Call to undefined function error after adding add_filter to wp-config (3 Solutions!!)

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Wordpress: Notice: Undefined index: filter in ...wp-includes/default-widgets.php on line 382
Wordpress: Notice: Undefined index: filter in ...wp-includes/default-widgets.php on line 382
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