diff --git a/sceneObjects/DMeshSO.cs b/sceneObjects/DMeshSO.cs
index 0f7feba..cbe6940 100644
--- a/sceneObjects/DMeshSO.cs
+++ b/sceneObjects/DMeshSO.cs
@@ -349,7 +349,7 @@ void on_mesh_changed(bool bInvalidateSpatial = true, bool bInvalidateDecomp = tr
 
         void validate_spatial()
         {
-            if ( enable_spatial && spatial == null ) {
+            if (enable_spatial && (spatial == null || !spatial.IsValid)) {
                 spatial = new DMeshAABBTree3(mesh);
                 spatial.Build();
             }