This is causing validation errors when they try to confirm their account:
An ActiveRecord::RecordInvalid occurred in user#confirm:
Validace je neúspešná: Address Musíte vložit adresu.
activerecord (3.2.22.3) lib/active_record/validations.rb:56:in `save!'
Actually looks like this is an older account, so they've somehow been able to delete the address information.