diff --git a/source/main.pas b/source/main.pas
index 3424641b..ed81e019 100644
--- a/source/main.pas
+++ b/source/main.pas
@@ -7411,6 +7411,7 @@ begin
     Exit;
   gr := GridResult(Sender);
   EnsureChunkLoaded(Sender, Node);
+  if Node.Index >= Cardinal(Length(gr.Rows)) then Exit;
   if (Node = Sender.FocusedNode) and (Column = Sender.FocusedColumn) then begin
     if not Sender.IsEditing then begin
       // Editors may not cover the whole cell rectangle, so any colored area looks broken then