ios - Can't add a nil AVCaptureInput -

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i have beta tester getting error when trying start video session on our ipad app using opentok ios webrtc sdk. app crashes every time. user on ipad 2 ios 6.1.3. have clue causing such error? best guess involving camera access, i'm @ loss be.

i think can prevent crash checking availability of avcaptureinput object before add avcapturesession.

to simplify check below code: 

    if ([session canaddinput: backcameradeviceinput])     {         [session addinput: backcameradeviceinput];     }

i wish helpful :)


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