wpmudev-updates plugin causing 502 error

The WPMUDEV-Updates plugin was discovered to be causing 502 errors whenever a user tried to log in on the site https://community.sum180.com/wp-admin. The front end wasn't affected, fortunately, but this was keeping everyone from logging in.
WP Engine found and solved this issue by disabling the plugin, and have error logs as well as GET requests, if that would help diagnose why it's doing this.