App triggers an exception when starting to play webcam texture. The issue is reproducible just with an external webcam. The app doesn't trigger an exception if the webcam is built in (e.g. laptop webcam).

Steps to reproduce:
1. Download attached project
2. Switch platform to UWP
3. Build project with IL2CPP or .NET backend
4. Connect external webcam
5. Open VS solution and make sure that webcam capability is enabled in Package.appxmanifest
6. Build and run on a local machine with debug configuration and x64 platform

Results: UWP app triggers an exception when starting to play webcam texture

Reproduced with: 2018.3.0a1, 2018.2.0b8, 2018.1.3f1, 2017.4.5f1, 2017.2.3p1, 2017.1.4f1