Save corruption

[Achedb0b]

Using the most recent version downloadable from fontforge.github.io on 8/1/18 on windows 10
Several times now when I go to save the project fontforge will crash and when I reload the project it will be badly corrupted. Missing font, duplicated or misplaced glyph slots. (double clicking the O slot will open the M slot) I've already lost a few hours of work because of this, luckily I made backups, but when saving can corrupt the file I don't think it will be an effective work around for long.

http://prntscr.com/hy4ckh I'm wondering if it's the kerning. I have some glyph combinations made to overlap each other.
Here's the .pfd file. I'd appreciate any advice on keeping the saves from getting corrupted.

Problem.zip

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