And maybe make a backup copy of your mongodb data dirs (while it is not running) and stash it somewhere safe before mucking about too much further. 😉
Error - Cannot read property 'toLowerCase' of undefined
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".
Are there any errors in your nodebb logs?
A good starting point would be to disable all third-party plugins and see if that resolves the issue.