Wrap grid export code in a try/except block, so we can catch a potential "Cannot determine name of table" error, occurring while trying to get the WHERE clause for DELETEs. See http://www.heidisql.com/forum.php?t=21168

source/exportgrid.pas

@@ -482,6 +482,7 @@ begin
       Exit;
   end;
 
+  try
     Screen.Cursor := crHourglass;
 
     SelectionOnly := grpSelection.ItemIndex = 0;
@@ -947,10 +948,20 @@ begin
         end;
       end;
     end;
-
-  Mainform.DisableProgress;
     Mainform.ShowStatusMsg(_('Freeing data...'));
     FreeAndNil(S);
+
+  except
+    // Whole export code wrapped here
+    on E:EDatabaseError do begin
+      Screen.Cursor := crDefault;
+      ErrorDialog(E.Message);
+    end
+    else
+      raise;
+  end;
+
+  Mainform.DisableProgress;
   Mainform.ShowStatusMsg;
   Screen.Cursor := crDefault;
 end;