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1) Open research;
2) Click on the X in the research queue for the current and only item;
3) Click on the new research (artillery range tech 2);
4) Click on Start Researching; and
5) BOOM.

Attached is the log file, dump, and the latest autosave (no mods).

It is repeatable.

1) Load the save;
2) Open the research screen and press X on the first of the two items in the research queue;
3) Select Artillery range increase and click Start Researching; and
4) Press ESC (not sure if that is the final straw).

However, I can prevent the crash if:

1) Load the save;
2) Open the research screen and press X on the second item in the research queue;
3) ESC and let the research finish; and
4) Now, start research artillery range increase and get back to building.