Undefined index, Undefined array key

  • Notice (Suppressed) Undefined index: delete 1
    wp-content/object-cache.php:281
    WP_Object_Cache->delete()
    wp_cache_delete()
    SiteOrigin_Widgets_Bundle->activate_widget()
    SiteOrigin_Premium_Plugin_Mirror_Widgets->activate_mirror_widget()
    do_action(‘after_setup_theme’)`

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