diff --git a/src/document/migrate-scene-document.ts b/src/document/migrate-scene-document.ts
index 91c5e328..5bb59a53 100644
--- a/src/document/migrate-scene-document.ts
+++ b/src/document/migrate-scene-document.ts
@@ -198,6 +198,7 @@ import {
   PLAYER_START_GAMEPAD_CAMERA_LOOK_SCENE_DOCUMENT_VERSION,
   PLAYER_START_INTERACT_BINDINGS_SCENE_DOCUMENT_VERSION,
   PLAYER_START_INPUT_BINDINGS_SCENE_DOCUMENT_VERSION,
+  PLAYER_START_MOUSE_INVERT_SCENE_DOCUMENT_VERSION,
   PLAYER_START_TARGETING_SETTINGS_SCENE_DOCUMENT_VERSION,
   PLAYER_START_NAVIGATION_MODE_SCENE_DOCUMENT_VERSION,
   PLAYER_START_PAUSE_BINDINGS_SCENE_DOCUMENT_VERSION,
diff --git a/src/runtime-three/first-person-navigation-controller.ts b/src/runtime-three/first-person-navigation-controller.ts
index 274c7ff1..4517b9d3 100644
--- a/src/runtime-three/first-person-navigation-controller.ts
+++ b/src/runtime-three/first-person-navigation-controller.ts
@@ -510,23 +510,25 @@ export class FirstPersonNavigationController implements NavigationController {
   };
 
   private handleMouseMove = (event: MouseEvent) => {
+    const context = this.context;
+
     if (
       !this.pointerLocked ||
-      this.context?.isInputSuspended() === true ||
-      this.context?.isCameraDrivenExternally() === true
+      context === null ||
+      context.isInputSuspended() === true ||
+      context.isCameraDrivenExternally() === true
     ) {
       return;
     }
 
     const horizontalMouseLookSign =
-      this.context.getRuntimeScene().playerStart?.invertMouseCameraHorizontal ===
-      true
+      context.getRuntimeScene().playerStart?.invertMouseCameraHorizontal === true
         ? -1
         : 1;
     const horizontalMovement = event.movementX * horizontalMouseLookSign;
 
     const targetLookResult =
-      this.context?.handleRuntimeTargetLookInput?.({
+      context.handleRuntimeTargetLookInput?.({
         horizontal: horizontalMovement,
         vertical: -event.movementY
       }) ?? null;