Crashing with TTF Export

Did a search but couldn’t see a definitive answer. When I try to export as TTF the software crashes. Using 1.4.5 - Mac OS X 10.10.5

I have a report - where can I send it?

Please send the crash report from the window that shows up after you restart Glyphs.
And can you send me the .glyphs file?

If you want to export ttf files, I strongly recommend upgrading to version 2.0.