--- a/gfx/vr/gfxVROpenVR.cpp
+++ b/gfx/vr/gfxVROpenVR.cpp
@@ -555,16 +555,20 @@ VRControllerManagerOpenVR::Destroy()
 }
 
 void
 VRControllerManagerOpenVR::HandleInput()
 {
   RefPtr<impl::VRControllerOpenVR> controller;
   vr::VRControllerState_t state;
 
+  if (!mOpenVRInstalled) {
+    return;
+  }
+
   MOZ_ASSERT(mVRSystem);
 
   // Process OpenVR controller state
   for (uint32_t i = 0; i < mOpenVRController.Length(); ++i) {
     controller = mOpenVRController[i];
 
     MOZ_ASSERT(mVRSystem->GetTrackedDeviceClass(controller->GetTrackedIndex())
                == vr::TrackedDeviceClass_Controller);