diff --git a/Source/Engine/Content/JsonAssetReference.cs b/Source/Engine/Content/JsonAssetReference.cs
index 86ad9a087..f78b23b73 100644
--- a/Source/Engine/Content/JsonAssetReference.cs
+++ b/Source/Engine/Content/JsonAssetReference.cs
@@ -130,7 +130,7 @@ namespace FlaxEngine
         /// <inheritdoc />
         public override string ToString()
         {
-            return Asset?.ToString();
+            return Asset?.ToString() ?? "null";
         }
 
         /// <inheritdoc />