[MCL-6975] Launcher 2.0.849 crashes on game exit

To help with testing for other bugs, I set up the launcher to not quit when the game is launched and also show me the debug window. When I quit the main game, I find that the launcher now crashes. MacOS provides a report of the crash that you can find here:
https://pastebin.com/1VRbWXDG

Linked issues

duplicates 1

MCL-5523 OSX: "Minecraft quit unexpectedly" on launcher startup Resolved

Comments 2

migrated 2017-04-12T19:24:43Z

Please do not mark unreleased versions as affected.
You don't have access to them yet.

migrated 2017-04-13T00:33:15Z

Since the version of the launcher that I have was not listed, I assumed that "unreleased" was the appropriate term for it. What are we supposed to do when the version we have isn't listed?