What can I do if there’s a compatibility issue and I can’t login?
When activating either Safe Mode or Ghost Mode, you will be asked to perform a test (enables you to check website functionality from a preview popup).
If you notice any issues at this point, you can abort.
You will also receive a SAFE URL (it’s very important that you save this). This way, you will be able to simply copy the safe URL to be able to login if there is a compatibility issue.
You can learn more about this process here >>
Also read: How to Disable Hide My WP Ghost In Case Of an Error.