Please share the credentials of the staging site and a copy of the plugin Social Warfare Pro via this contact form https://metabox.io/contact/. I will check it and see if something we can do from our side.
I've received your site info in the ticket system. Looking through the codebase of the plugin Social Warfare Pro, I see that it uses Meta Box as a library and modifies our codebase a little bit. Please try to contact the plugin support to check if the Meta Box plugin (class RWMB_Loader) has been inited before to fix this issue.