diff --git a/Runtime/RuntimeUtil.cs b/Runtime/RuntimeUtil.cs
index de3d24a..e0f78db 100644
--- a/Runtime/RuntimeUtil.cs
+++ b/Runtime/RuntimeUtil.cs
@@ -57,7 +57,7 @@ internal static T GetOrAddComponent<T>(this Component obj) where T : Component
         [CanBeNull]
         public static string RelativePath(GameObject root, GameObject child)
         {
-            return RelativePath(root.transform, child.transform);
+            return RelativePath(root?.transform, child?.transform);
         }
 
         /// <summary>