**Steps to replicate the issue** (include links if applicable):
Operating System Ubuntu 20.04
Software installed: Apache, MariaDB
* Install mediawiki 1.39.5
* Install Grabbers [https://github.com/weirdgloop/mediawiki-tools-grabbers]
* run grabText.php on remote wiki
Per remote wiki's hostile policy, unable to disclose remote wiki's url until migrated wiki formally announces
**What happens?**:
ERROR: CannotCreateActorException from line 622 of ActorStore.php: Cannot create an actor for a user with no name: user_id=0 user_name="3403151"
**What should have happened instead?**:
This should not have occurred and all text revisions should have copied correctly without error.
Compliance to erase accounts under GDPR is possibly causing unintended corruption.
**Software version** (skip for WMF-hosted wikis like Wikipedia): 1.39.5