diff --git a/source/childwin.pas b/source/childwin.pas
index 9b9a485d..b2cfed68 100644
--- a/source/childwin.pas
+++ b/source/childwin.pas
@@ -2169,6 +2169,7 @@ begin
   MainForm.actCopyAsXML.Enabled := inDataOrQueryTabNotEmpty;
   MainForm.actExportData.Enabled := inDataOrQueryTabNotEmpty;
   MainForm.actHTMLView.Enabled := inDataOrQueryTabNotEmpty;
+  setNull1.Enabled := inDataTab and Assigned(DataGrid.FocusedNode);
 
   // Query tab
   MainForm.actLoadSQL.Enabled := FrmIsFocussed;