Gravity forms registration

I was using gravity forms as a registration form with buddypress integration to create new users and it was work fine. now after the last WPLMS update when any user tries to register and press submit button a fatal error message appeared to him!! fatal error: --- Fatal error: Uncaught Error: Cannot use object of type WP_User as array in /opt/bitnami/apps/wordpress/htdocs/wp-content/plugins/wplms_plugin/includes/vibe-shortcodes/shortcodes.php:4820 Stack trace: #0 /opt/bitnami/apps/wordpress/htdocs/wp-includes/class-wp-hook.php(292): Vibe_Define_Shortcodes->activate_user() #1 /opt/bitnami/apps/wordpress/htdocs/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters() #2 /opt/bitnami/apps/wordpress/htdocs/wp-includes/plugin.php(484): WP_Hook->do_action() #3 /opt/bitnami/apps/wordpress/htdocs/wp-content/plugins/gravityformsuserregistration/class-gf-user-registration.php(1939): do_action() #4 /opt/bitnami/apps/wordpress/htdocs/wp-includes/class-wp-hook.php(294): GF_User_Registration->do_buddypress_user_signup() #5 /opt/bitnami/apps/wordpress/htdocs/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters() #6 /opt/bitnami/apps/wordpress/htdocs/wp-includes/plugin.php(484): WP_Hook->do_action() #7 /opt/bitnami/apps/wordpress/htdocs/wp-content/plugins/gravityformsuserregistration/cla in /opt/bitnami/apps/wordpress/htdocs/wp-content/plugins/wplms_plugin/includes/vibe-shortcodes/shortcodes.php on line 4820 --- in backend, I found users who submitted the forms has been created successfully, and can login please advise about this error