Error when plugin is disabled on a multisite

When the plugin is disabled on a multisite in order to remove the hide login function then logging in is not possible. Example of an error message below. It is similar in all browsers, including Chrome Incognito. Is there an extra step to disable the hide login on a multisite?

Error:
The page isn’t redirecting properly

Firefox has detected that the server is redirecting the request for this address in a way that will never complete.

The page I need help with: [log in to see the link]