Unable to create new project after updating to version 13 (error 500)

Updated to version 13 (using docker ce version) and everything looked fine until I tried to create a new project, then was greeted with this screen:

I attacj my production.log file, where there is the error:

Completed 500 Internal Server Error in 53ms (ActiveRecord: 13.9ms | Elasticsearch: 0.0ms | Allocations: 17921)
  
NoMethodError (undefined method `first' for nil:NilClass):

I already tried cleaning the cache as recommended in this issue, with no luck.

I also tried wiping up the docker and reinstalling from a backup. But it stays the same.

Any help is appreciated.

production.log