Hmm... this is a really strange engine-level error that I've never seen before on any of our games. There's not an error on any particular line number, or even in our part of the game really. This happened when trying to draw a regular image of some kind (the background of a world map tile), so that part is utterly normal. But the error message given is "Update: System.ExecutionEngineException: SIGILL"
There's very little information on google or at Unity about this, and the one thing on Unity is about having too many assets added. But they had waaaay more assets added than we do, and the memory being used by the game runtime at the time of your error (per the log file) was only 114MB. Hardly taxing.
This is quite odd indeed, particularly because I don't have any other reports of this. We've seen some funky one-off errors in the past on various others of our games, and typically those were the result of a partially corrupt install. Just doing a "verify local game files" in Steam probably would fix the issue -- knock on wood.
If that doesn't work, then if this happens again can you also post your output.log file from inside the Collapse_Data folder inside the root data folder? Every time you run the game that gets overwritten, so I doubt you have that now unless you haven't run the game again since this error.
Hope that helps!