Error - Cannot read property 'toLowerCase' of undefined

[Felix001]

Hello! Please help me fix this error, when I try create new user in ACP or try accept user registration, i have this "Cannot read property 'toLowerCase' of undefined".

[PitaJ]

Are there any errors in your nodebb logs?

[julian]

A good starting point would be to disable all third-party plugins and see if that resolves the issue.