Ahh, that sounds like a problem with the automatic ingredient push setting. To stop the crashes on your side, you can disable the setting with your map loaded, save the game, and then reload the same map, and I think that should preserve the setting changes. That setting is just to prevent things like 1 underground belt (when that item normally crafts in pairs) from clogging in the input slot, waiting for a second underground belt, so if you aren't mass recycling things like that, then it won't change anything for you.
If you are... then I guess I'll have to look into that issue. It's the second error regarding invalid entities that I've gotten recently (though they never provided any additional info), so I should probably actually fix it at some point.
