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I'm getting this error, I think it's because of chunk generation:

71.903 Error MainLoop.cpp:943: Exception at tick 20617755: Error while running event rso-mod::on_chunk_generated (ID 12)
__rso-mod__/control.lua:630: attempt to compare number with nil

You are correct.
I have no idea how... that line has 2 conditionals with 3 variables that are initialized or present in config file.
Please make sure you have current version of mod and it's not modified.

If it still crashes then please post save/mods and I'll take a look. There might be configuration that somehow slips past all the checks I have.

It was the config that I was using that seemed to cause the crash, it had "slightly" buffed up spawn rates

It's weird because I've had this save since 0.15.4 or so and it was working fine up until now.

http://imgur.com/a/1EYnW

You did not merge changes to config file that were made recently on collision avoidance.
So you don't have one of variables and therefore a crash since code expects it to exists.