fix: crash on right-click in empty area of query result grid

ansgarbecker · ansgarbecker · commit 630930542529 · 2026-02-19T19:51:55.000+01:00
Related to a forum post: https://www.heidisql.com/forum.php?t=44747
diff --git a/source/main.pas b/source/main.pas
@@ -3544,7 +3544,7 @@ procedure TMainForm.actDataPreviewUpdate(Sender: TObject);
   // Enable or disable ImageView action
   Grid := ActiveGrid;
   (Sender as TAction).Enabled := (Grid <> nil)
-    and (Grid.FocusedColumn-1 <> NoColumn)
+    and (Grid.FocusedColumn > 0) // may be NoColumn/-1 or InvalidColumn/-2
     and (GridResult(Grid).DataType(Grid.FocusedColumn-1).Category = dtcBinary)
 end;
 
