[Smush Pro] Smush Pro Causing Media Library to Stop Loading

Over the weekend, when accessing our website I noticed the media library would not load. The little circular icon would keep spinning but nothing would load. After deactivating different plugins I noticed the problem was Smush Pro. When I activate, the library won't load. When I deactivate, the library works as it should.

Additionally, one of your support staff had given me a custom "mu-plugin", allowing me to choose which images would or would not be super smushed. It worked as it should until this issue, which caused my site to break when i initially deactivated smush. So I had to remove the custom plugin through ftp for my site to go back on.