[0.12.8] Unexpected error occurred when I had the full screen map and a stone furnace GUI open

[Twisted_Code]

While I wasn't able to reproduce it, these are the steps that caused me to crash.
Step 1: open a GUI (I opened a stone furnace. I'm not sure if this is the only one that causes this crash)
Step 2: open the fullscreen map (default key: M)
Step 3: open the pause menu (default key: escape)
step 4: error message pops up saying "unknown error occurred". Please note that the error may have begun before step three, but I couldn't be sure.
My operating system is Windows 8.1 64-bit. I'm running Factorio 0.12.7 64-bit

factorio-previous.log

This should be the relevant log file

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if you need any more information, just ask.

[kovarex]

Well, I also wasn't able to reproduce it, and is it happens only once, the cause might be a lot of stuff.

I'm moving it to pending until we get more clues or until it happens again.