diff --git a/Source/Engine/Serialization/JsonConverters.cs b/Source/Engine/Serialization/JsonConverters.cs
index 3130b597f..3da6342e2 100644
--- a/Source/Engine/Serialization/JsonConverters.cs
+++ b/Source/Engine/Serialization/JsonConverters.cs
@@ -244,16 +244,21 @@ namespace FlaxEngine.Json
         /// <inheritdoc />
         public override void WriteJson(JsonWriter writer, object value, Newtonsoft.Json.JsonSerializer serializer)
         {
+#if FLAX_EDITOR
+            bool writeTypename = (serializer.TypeNameHandling & TypeNameHandling.Objects) == TypeNameHandling.Objects;
+#else
+            bool writeTypename = false;
+#endif
             var str = (LocalizedString)value;
-            if (string.IsNullOrEmpty(str.Id))
+            if (string.IsNullOrEmpty(str.Id) && !writeTypename)
             {
-                writer.WriteValue(str.Value);
+                writer.WriteValue(str.Value ?? string.Empty);
             }
             else
             {
                 writer.WriteStartObject();
 #if FLAX_EDITOR
-                if ((serializer.TypeNameHandling & TypeNameHandling.Objects) == TypeNameHandling.Objects)
+                if (writeTypename)
                 {
                     writer.WritePropertyName("$type");
                     writer.WriteValue("FlaxEngine.LocalizedString, FlaxEngine.CSharp");