ok, understand. Please update the code via Plugin editor, and let me know the status. It should work
Change line 829 and 830 with
else
{
$gr_user_max_discount = WC()->session->get('gr_user_max_discount');
WC()->session->set( 'gr_user_applied_discount', ( ! empty( $gr_user_max_discount ) ? $gr_user_max_discount : 0 ) );
}
