diff --git a/JL.Windows/Utilities/PopupWindowUtils.cs b/JL.Windows/Utilities/PopupWindowUtils.cs
index 8feecb61..1240759f 100644
--- a/JL.Windows/Utilities/PopupWindowUtils.cs
+++ b/JL.Windows/Utilities/PopupWindowUtils.cs
@@ -67,7 +67,7 @@ public static string ReadingsToText(string[] readings, string[]?[] rOrthographyI
         {
             _ = sb.Append(readings[index]);
 
-            if (index < rOrthographyInfoList?.Length)
+            if (index < rOrthographyInfoList.Length)
             {
                 string[]? rOrthographyInfo = rOrthographyInfoList[index];
                 if (rOrthographyInfo is not null)