502 Bad Gateway – Plugin Conflict with Query Monitor

  • I am reporting a plugin conflict with Query Monitor plugin installed and activated alongside Titan Anti-spam & Security (free).

    Our website recently started experiencing 502 Bad Gateway errors in numerous places, mostly in the admin backend for certain operations such as searching users, deleting posts and making certain updates. Many REST requests such as many JSON needed for editing posts in the blocks editor returned 502 errors as well.

    We were able to reproduce the issue on a staging site where we switched to a default theme and disabled all plugins which removed the issue. After trial and error the two plugins were identified.

    To confirm the conflict, only the two plugins were enabled. Even MU plugins were removed. If either of the plugins was disabled the issue went away.

    To reproduce the issue the easiest and most straightforward action that will reproduce the issue is saving the permalink settings page.

    Our host is WP Engine.

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