Don’t know how to replicate it exactly. A lot of people are using our site. And didn’t have time to investigate it how to replicate it.
But this would stop the warning…
/wp-content/plugins/bp-restrict/includes/options/inc/extensions/customizer/extension_customizer.php line 507
Replacing…
if ( $option['type'] != "heading" && $option['type'] != "import_export" && ! empty( $option['type'] ) ) {
…with…
if ( isset( $option['type'] ) && $option['type'] != "heading" && $option['type'] != "import_export" && ! empty( $option['type'] ) ) {
