Bug: Crash when using cmd-u to add anchors to combining glyphs

Hello there,

With the current cutting-edge version – 2.5b (1073) – Glyphs decides to crash when I try to add anchors to a combining glyph using cmd-u.
I tried this with dieresiscomb and acutecomb. It also does not make a difference if there is an outline in the glyph or not.

Do you know what the cause of this is?

I fixed that.