E_Error

I got an email saying “An error of type E_ERROR was caused in line 503 of the file /home3/plyvstmy/public_html/wp-content/plugins/responsive-lightbox/includes/class-frontend.php. Error message: Uncaught Error: Unsupported operand types in /home3/plyvstmy/public_html/wp-content/plugins/responsive-lightbox/includes/class-frontend.php:503″

I have not experienced any issues on the site. Should I worry about this? I have no idea how to fix it or figure it out. I saw someone else had this same email in the forum, but no one replied to their inquiry.

Other information:
WordPress version 5.5.3
Current theme: Infinity Pro (version 1.3.2)
Current plugin: Responsive Lightbox & Gallery (version 2.2.3.1)
PHP version 7.3.24
`Stack trace:
#0 /home3/plyvstmy/public_html/wp-content/plugins/responsive-lightbox/includes/class-galleries.php(3798): Responsive_Lightbox_Frontend->get_unique_fields(Array, NULL)
#1 /home3/plyvstmy/public_html/wp-content/plugins/responsive-lightbox/includes/class-galleries.php(4145): Responsive_Lightbox_Galleries->save_gallery(Array, 7004, true)
#2 /home3/plyvstmy/public_html/wp-includes/class-wp-hook.php(287): Responsive_Lightbox_Galleries->save_revision(7004)
#3 /home3/plyvstmy/public_html/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(”, Array)
#4 /home3/plyvstmy/public_html/wp-includes/plugin.php(478): WP_Hook->do_action(Array)
#5 /home3/plyvstmy/public_html/wp-includes/revision.php(345): do_action(‘_wp_put_post_re…’, 7004)
#6 /home3/plyvstmy/public_html/wp-admin/includes/post.php(1874): _wp_put_post_revision(Array, true)
#7 /home3/plyvstmy/public_