Deserializing error migrating from v4 to v5

I am trying to migrate from a v4 installation on one server to another running v5 using docker-compose. The initial setup of v5 works well, but after starting the migration on my v4 instance I get locked out of the v5 server because of the following error on the login page:

error

Any idea how to debug this?

Hi @flofeld

I have made a change to both the V4 master branch and V2 branch which contains fixes for this.

You can try remigrating and it should work.