diff --git a/src/bit-systems/audio-debug-system.ts b/src/bit-systems/audio-debug-system.ts
index 92fd151b07..a14964fa76 100644
--- a/src/bit-systems/audio-debug-system.ts
+++ b/src/bit-systems/audio-debug-system.ts
@@ -119,7 +119,9 @@ getScene().then(() => {
 const addDebugMaterial = (world: HubsWorld, navEid: number) => {
   const obj = world.eid2obj.get(navEid);
   if (obj) {
-    const navMesh = obj as Mesh;
+    // Some older scenes have the nav-mesh component as an ancestor of the mesh itself
+    // TODO the "as any" here is because of incorrect type definition for getObjectByProperty. It was fixed in r145
+    const navMesh = obj.getObjectByProperty("isMesh", true as any) as Mesh;
     navMesh.visible = isEnabled;
     if (nav2mat.has(navEid)) return;
     nav2mat.set(navEid, navMesh.material);
@@ -132,7 +134,9 @@ const addDebugMaterial = (world: HubsWorld, navEid: number) => {
 const removeDebugMaterial = (world: HubsWorld, navEid: number) => {
   const obj = world.eid2obj.get(navEid);
   if (obj) {
-    const navMesh = obj as Mesh;
+    // Some older scenes have the nav-mesh component as an ancestor of the mesh itself
+    // TODO the "as any" here is because of incorrect type definition for getObjectByProperty. It was fixed in r145
+    const navMesh = obj.getObjectByProperty("isMesh", true as any) as Mesh;
     navMesh.visible = false;
     if (!nav2mat.has(navEid)) return;
     navMesh.material = nav2mat.get(navEid)!;