Steps to reproduce: Make a complete generator and remove a part with a sticky piston, the game crashes (but doesn't corrupt the world, fortunately).

Workaround: Don't do this.

The mod has been recently updated to MC 1.16, older versions are no longer supported.
I'm mass closing older issues to clear up clutter in the bug tracker.

If you find this issue still exists in the current version feel free to reopen it.