We’ve recently discovered an issue in 2019.1.0f2 where mobile VR apps may crash when using MultiView. One specific case is when using particle systems.
The current solutions are to stick to 2018.3, or 2019.1.0b9, or to temporarily switch to MultiPass rendering.
We’re working to get a fix in as quickly as possible. Currently we are aiming for a fix in 2019.1.1, but I will update here if that changes.