Crash on [AVCaptureSession addInput:]

[elikohen]

There are no checks for errors when AVCaptureDeviceInput *deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil] so if an error occurs, deviceInput will be nil and the following call to [_session addInput:deviceInput] will crash.

We cannot reproduce it on development, but we see several crashes on our production app on crashlytics:

Fatal Exception: NSInvalidArgumentException
0  CoreFoundation                 0x184aa51b8 __exceptionPreprocess
1  libobjc.A.dylib                0x1834dc55c objc_exception_throw
2  AVFoundation                   0x18c287c70 -[AVCaptureSession addInput:]
3  FastttCamera                   0x100f42170 __36-[FastttCamera _setupCaptureSession]_block_invoke.150 (FastttCamera.m:436)
4  libdispatch.dylib              0x18392e1fc _dispatch_call_block_and_release
5  libdispatch.dylib              0x18392e1bc _dispatch_client_callout
6  libdispatch.dylib              0x183932d68 _dispatch_main_queue_callback_4CF
7  CoreFoundation                 0x184a52810 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__
8  CoreFoundation                 0x184a503fc __CFRunLoopRun
9  CoreFoundation                 0x18497e2b8 CFRunLoopRunSpecific
10 GraphicsServices               0x186432198 GSEventRunModal
11 UIKit                          0x18a9c57fc -[UIApplication _run]
12 UIKit                          0x18a9c0534 UIApplicationMain

Is there any reason why there are no such checks?

Thanks in advance

[bikalay]

Check if your app have permission to use camera