diff --git a/GameUI/LAtkValue.cs b/GameUI/LAtkValue.cs
index 427e7f6..70982ff 100644
--- a/GameUI/LAtkValue.cs
+++ b/GameUI/LAtkValue.cs
@@ -7,6 +7,8 @@ public static class LAtkValue
 {
     public static unsafe string? ReadAtkString(this AtkValue atkValue)
     {
+        if (atkValue.Type == ValueType.Undefined)
+            return null;
         if (atkValue.String != null)
             return MemoryHelper.ReadSeStringNullTerminated(new nint(atkValue.String)).ToString();
         return null;