Don't add transforms to non-existent entities.

src/sound/volumetric.rs

@@ -39,10 +39,16 @@ fn update(
     }
 }
 
-fn removed(mut commands: Commands, mut removed: RemovedComponents<Volumetric>) {
+fn removed(
+    mut commands: Commands,
+    mut removed: RemovedComponents<Volumetric>,
+    transforms: Query<Entity, (With<Transform>, With<GlobalTransform>)>,
+) {
     for entity in &mut removed {
+        if transforms.get(entity).is_ok() {
             commands.entity(entity).insert(TransformBundle::default());
         }
+    }
 }
 
 pub struct VolumetricPlugin;