Various PHP warnings, notices and a fatal error

Just thought I’d share this!

PHP message: PHP Notice: Undefined index: rl_gallery in /wp-content/plugins/responsive-lightbox/includes/class-galleries.php on line 2716
PHP message: PHP Notice: Undefined index: options in /wp-content/plugins/responsive-lightbox/includes/class-galleries.php on line 2766
PHP message: PHP Warning: Invalid argument supplied for foreach() in /wp-content/plugins/responsive-lightbox/includes/class-galleries.php on line 1117
PHP message: PHP Notice: Undefined index: Global_gallery in /wp-content/plugins/responsive-lightbox/includes/class-galleries.php on line 2736
PHP message: PHP Notice: U ndefined index: Global_gallery in /wp-content/plugins/responsive-lightbox/includes/class-galleries.php on line 2737
PHP message: PHP Warning: Invalid argument supplied for foreach() in /wp-content/plugins/responsive-lightbox/includes/class-galleries.php on line 2742
PHP message: PHP Warning: array_intersect_key(): Argument #2 is not an array in /wp-content/plugins/responsive-lightbox/includes/class-frontend.php on line 481

PHP message: PHP Fatal error: Uncaught Error: Unsupported operand types in /wp-content/plugins/responsive-lightbox/includes/class-frontend.php:491
Stack trace:
#0 /wp-content/plugins/responsive-lightbox/includes/class-galleries.php(2751): Responsive_Lightbox_Frontend->get_unique_fields(Array, NULL)
#1 /wp-content/plugins/responsive-lightbox/includes/class-galleries.php(3093): Responsive_Lightbox_Galleries->save_gallery(Array, 410, true)
#2 /wp-includes/class-wp-hook.php(286): Responsive_Lightbox_Galleries->save_revision(410)
#3 /wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters('', Array)
#4 /wp-includes/plugin.php(453): WP_Hook->do_action(Array)
#5 https://your.domain/wp-admin/post.php?post=345&action=edit&rl_active_tab=lightbox