Lightmap manager - selection baking - Unity crash

Hi,
I'm use Unity 4.34f1 in mac os X 10.9.2.
If i try to click at selection baking in advanced tab of Lightmap Manager Unity crash.
I try to bake total lightmap and no problem with that (by advanced tab Bake button).
However if i select a mesh (fbx) that finish with crash.

Screenshot of the error :