Reproduction steps:
1. Open the attached project.
2. Build and run it on device.
- Application crashes.

Alternative reproduction steps:
1. Create a new project.
2. Go to Player Settings.
3. Select iOS platform.
4. Expand Other Settings in the inspector.
5. Check "Virtual Reality Supported".
6. Add "Cardboard".
7. Build and run it on device.
- Application crashes.

Stack trace:
frame #0: ProductName`::SetSharedMesh() at MeshFilter.cpp:41 [opt]
frame #1: ProductName`::CreateSplashQuad() at VRSplashScreen.cpp:179 [opt]
frame #2: ProductName`::CreateSplashObjects() at VRSplashScreen.cpp:266 [opt]
frame #3: ProductName`::Update() at VRSplashScreen.cpp:91 [opt]
frame #4: ProductName`::UpdateVRSplashScreen() at VRDevice.cpp:257 [opt]
...

Reproduced with:
5.6.0b7, 5.6.0b10, 2017.1.0a2
iPadMini 4 iOS 9.3.2, iPhone 5 iOS 10.1.1

Notes:
- Full stack trace attached in the edit.
- Feature introduced in 5.6.0b7.