diff --git a/LogGrokCore/Controls/TextRender/TextControl.cs b/LogGrokCore/Controls/TextRender/TextControl.cs
index a485f86..81b94a5 100644
--- a/LogGrokCore/Controls/TextRender/TextControl.cs
+++ b/LogGrokCore/Controls/TextRender/TextControl.cs
@@ -323,6 +323,9 @@ private static (int start, int length) GetWordSelectionRange(StringRange lineTex
             left--;
         }
 
+        if (position >= span.Length)
+            return (left, span.Length - left);
+
         var right = position;
         while (right < span.Length - 1 && IsWordPart(span[right + 1]))
         {