Crash in [TGCamera setupWithFlashButton:], nil AVCaptureInput

[tspop]

Can't reproduce the issue, happens rarely in production.

Seems like not checking for errors in this code is the offender, not sure what sort of error can be triggered here.

AVCaptureDeviceInput *deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];

Stack Trace:

*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[AVCaptureSession addInput:] Can't add a nil AVCaptureInput' TGCamera.m, line 208

1	CoreFoundation	__exceptionPreprocess + 124
2	libobjc.A.dylib	objc_exception_throw + 52
3	AVFoundation	-[AVCaptureSession addInput:] + 900
4	TGCameraViewController	-[TGCamera setupWithFlashButton:] (TGCamera.m:208)
5	TGCameraViewController	+[TGCamera cameraWithFlashButton:] (TGCamera.m:58)
6	TGCameraViewController	-[TGCameraViewController viewDidLoad] (TGCameraViewController.m:117)
7	UIKit	-[UIViewController loadViewIfRequired] + 1036
8	UIKit	-[UINavigationController _updateScrollViewFromViewController:toViewController:] + 72
9	UIKit	-[UINavigationController _startTransition:fromViewController:toViewController:] + 192
10	UIKit	-[UINavigationController _startDeferredTransitionIfNeeded:] + 1164
11	UIKit	-[UINavigationController __viewWillLayoutSubviews] + 120
12	UIKit	-[UILayoutContainerView layoutSubviews] + 184
13	UIKit	0x1a2a6f000 + 595476
14	UIKit	_runAfterCACommitDeferredBlocks + 288
15	UIKit	_cleanUpAfterCAFlushAndRunDeferredBlocks + 284
16	UIKit	_afterCACommitHandler + 128
17	CoreFoundation	__CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 28
18	CoreFoundation	__CFRunLoopDoObservers + 408
19	CoreFoundation	__CFRunLoopRun + 1288
20	CoreFoundation	CFRunLoopRunSpecific + 432
21	GraphicsServices	GSEventRunModal + 96
22	UIKit	UIApplicationMain + 204
23	<Redacted>	main (AppDelegate.swift:18)
24	libdyld.dylib	start + 0