extendscript app crash on preferences panel when clicking on colors and fonts sub menu

hello there,

I'm newbie to After effects scripting.

i'm using AE cc2015 with extend script app (osX el captain).

here is my problem :

when i try to change font size in preferences panel,

the app crashes when i click on colors and fonts submenu (in preferences panel).

Are there some tips to correct this trouble ?

Is there a pro that can help me on this ?

Regards