Crashes if you switch cameras and turn the flash on

[wizard1066]

Comment says it all. CRASHES if you use the selfie view with the flash on.

[lukelucas247]

Inside: func captureImage(completion: @escaping (UIImage?, Error?) -> Void) {}

Change:
settings.flashMode = self.flashMode

With:

if currentCameraPosition == .front {
                       settings.flashMode = AVCaptureDevice.FlashMode.off
               } else if currentCameraPosition == .rear {
                       settings.flashMode = self.flashMode
               }