One of developers created a "\" address by mistake, how to delete?

[Edson Richter]

Hi!
Using ActiveMQ Artemis 2.22.0 with OpenJDK 11.
One of developers created in development server a address "\", and we cannot 
delete it! Is there any "escape" that need to be applied?
Maybe the best way to describe the problem is using a screenshot:

[cid:image001.png@01DC254D.3F6D9D10]