Administrator user can't create new user : Database corrumption?

hi, in the past I managed to create user and today anytime I try to create a new one I get a message "Username is empty" even if it is not.

I can find anything in the log, could it come from MySql Database corruption which I use for right management? I have many things done in my database and I don't want to rerun a migration.

Thank in advance, in attach screen shoot of the error.


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