Thanks for response. The only log I have is:
+[CATransaction synchronize] called within transaction
libc++abi.dylib: terminate_handler unexpectedly threw an exception
(lldb)
Just double checked that TwitterKit resource bundle is installed under Pods.
It gets crashed right from the beginning before it hits anything in AppDelegate. Also, the crash only happens for iOS9. iOS8.1 works fine. I just noticed in the change log that 1.13.1 fixed a crash issue when there is no login user. Maybe the fix still doesn’t work for iOS9? My app does not require user login.