MAC: Crash when quitting from the help menu

[noahsark769]

Crashes on mac if you open quit when in the help menu.

To reproduce:

1. open a show
2. Open help
3. press cmd-q to quit
4. Crashes

Crash log: https://www.evernote.com/shard/s207/sh/b70312e2-b1bc-42ef-b212-ce2a3a2ba9b0/8d149dc8ae0ef71a13f1fcd7128807c5

[kmdurand]

Fixed in #75