A simple uBlock origin fix to block the script distributed to block add blockers from blockadblock. The repository contains the script that is distributed as well as an unobfuscated script.
Add the following to My filters in the uBlock origin dashboard
example.com##^script:has-text(eval)
Change example.com to the domain that is executing the blockadblock script.
This simply blocks the initial call to eval - which is a probably good thing to block in general!