--- a/gfx/vr/gfxVROpenVR.cpp
+++ b/gfx/vr/gfxVROpenVR.cpp
@@ -509,26 +509,26 @@ VRSystemManagerOpenVR::GetHMDs(nsTArray<
   if (mOpenVRHMD) {
     aHMDResult.AppendElement(mOpenVRHMD);
   }
 }
 
 void
 VRSystemManagerOpenVR::HandleInput()
 {
+  // mVRSystem is available after VRDisplay is created
+  // at GetHMDs().
+  if (!mVRSystem) {
+    return;
+  }
+
   RefPtr<impl::VRControllerOpenVR> controller;
   vr::VRControllerState_t state;
   uint32_t axis = 0;
 
-  if (!mOpenVRInstalled) {
-    return;
-  }
-
-  MOZ_ASSERT(mVRSystem);
-
   vr::TrackedDevicePose_t poses[vr::k_unMaxTrackedDeviceCount];
   mVRSystem->GetDeviceToAbsoluteTrackingPose(vr::TrackingUniverseSeated, 0.0f,
                                              poses, vr::k_unMaxTrackedDeviceCount);
   // Process OpenVR controller state
   for (uint32_t i = 0; i < mOpenVRController.Length(); ++i) {
     controller = mOpenVRController[i];
 
     MOZ_ASSERT(mVRSystem->GetTrackedDeviceClass(controller->GetTrackedIndex())