I have an account at boardgameareana.com under the name of "null" (the string value of "null" without quotes)

This has resulted in a few errors like this over the last couple years.
For example, if I got to: https://boardgamearena.com/forum/viewtopic.php?f=10&t=34569
I get the error:

SQL ERROR [ mysqli ]

Duplicate entry 'null' for key 'username_clean' [1062]

An SQL error occurred while fetching this page. Please contact the Board Administrator if this problem persists. 

I had reported this to BGA a while back, and they never responded to the issue.
I figured I'd try to send it to phpBB directly (I don't know if it's an issue related to phpBB or BGA).  If it's not a generic phpBB issue, please disregard.