diff --git a/hello-world/src/test_scene.rs b/hello-world/src/test_scene.rs
index 9ae8741..a3c66ca 100644
--- a/hello-world/src/test_scene.rs
+++ b/hello-world/src/test_scene.rs
@@ -18,7 +18,7 @@ impl Plugin for TestScenePlugin {
             })
             .add_systems(Startup, spawn_scene)
             .add_systems(
-                Update,
+                PostUpdate,
                 move_plane_with_camera.after(orbit_cam::pan_orbit_camera),
             );
     }
@@ -93,13 +93,14 @@ fn spawn_scene(
 
 fn move_plane_with_camera(
     mut plane: Query<(&WorldGridPlane, &mut Transform)>,
-    camera: Query<&OrbitCam>,
+    camera: Query<&OrbitCam, Changed<OrbitCam>>,
 ) {
-    let &OrbitCam { focus, .. } = camera.single();
-    let (_, mut xform) = plane.single_mut();
+    if let Ok(&OrbitCam { focus, .. }) = camera.get_single() {
+        let (_, mut xform) = plane.single_mut();
 
-    xform.translation.x = focus.x;
-    xform.translation.z = focus.z;
+        xform.translation.x = focus.x;
+        xform.translation.z = focus.z;
+    }
 }
 
 #[derive(AsBindGroup, Clone, TypePath, TypeUuid)]