When a document is open? An old one?
El Capitan is not officially supported. CS6 works, but not well. You should consider to upgrade to Creative Cloud.
The most common reason for crashes: Go to System Preferences > General in El Capitan and uncheck Hide Menu option.
no, its document recently created. it crashes whenever I use the Typetools.
Am Freitag, 16. Oktober 2015 schrieb Willi Adelberger :
crashes after EL CAPITAN created by Willi Adelberger
<https://forums.adobe.com/people/Willi+Adelberger> in InDesign - View
the full discussion <https://forums.adobe.com/message/8074135#8074135>