The GoogleVR plugin shipped with UE4 is deprecated since UE4.24 and the last version supporting iOS was UE4.21. Reports suggest it was crashing on all the supported platforms (Android and iOS) since UE4.21. In the mean time, Google abandoned the old SDK (the one used by the GoogleVR plugin) and started developing a new SDK for Cardboard. This new SDK is the one integrated by our Cardboard VR plugin.