ERROR: You are trying to login with an administrative account.

Hi there, I don’t know why, and I didn’t add new plugins or themes to my staging site, but I got this error when I’m trying to login:

ERROR: You are trying to login with an administrative account. Please, use the Custom Login URL instead.

And I’m using the Custom Login URL indeed

However, my production site doesn’t have this problem, which is good. I saw there was an update of the plugin 3 days ago, but I have last version on both sites. In production works, but not on the staging one.

If I disable the custom URL feature it works, and of course, if I disable the plugin. I tried even to delete it, but I saw it saves my data and it doesn’t delete it.

Perhaps it’s a stupid thing I didn’t consider but I don’t have any clue. Do you have any idea or give me some light how to deal with this? Thanks in advance!