add_action('wp_ajax_facetwp_refresh', function() { while (ob_get_level()) ob_end_clean(); } add_action('wp_ajax_facetwp_refresh', function() { ob_clean(); }); add_action('wp_ajax_nopriv_facetwp_refresh', function() { ob_clean(); }); ); Additionally, paste this code immediately after the opening tag:

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