Sitemap Plus: Repeatable crash after udating to Big Sur

I’ve just updated my 2017 Macbook Air to Big Sur, started to add the licences to the various plugins etc. and have found a consistent repeatable crash with Sitemap Plus by @isaiah

  1. Launch RW
  2. Add a SMP page
  3. Click Search Engine tab in main window.
  4. Crash. Everytime.

RW 8.whatever the latest is
Stacks 4.0.4 (can’t use the latest version, it crashes)
I can’t see how to discover the version for SMP, but I’m getting no update notices, so assume it’s the latest.

It’s a clean install of Big Sur.

Anyone else seeing the same?

Crash report available, can’t upload it here.

Try latest beta: