Same crash and error on my 2017 Macbook Pro running Reason 10.4d4 on Mojave 10.14.5. So frustrating. On the bright side, I found this thread! So, now I know I don't have to keep banging my head against a wall trying to fix it.

Bumping this. I've just spent the last 2 hours trying to find this feature. Can't believe it doesn't exist in a modern DAW.