diff --git a/sane/scanner.cpp b/sane/scanner.cpp
index 4bf4e7c..b36aa38 100644
--- a/sane/scanner.cpp
+++ b/sane/scanner.cpp
@@ -2442,15 +2442,19 @@ COM_API_IMPLEMENT(scanner, int, start(void))
 	//}
 	else
 	{
-		if (callback::show_progress_ui && is_bIndicator)
-		{
-			int ev = SANE_EVENT_WORKING;
-
-		//	on_ui_event(ev, (void*)ev);
-			ui_notify(SANE_EVENT_SCAN_FINISHED, (void *)hg_scanner_err_description(ret), ret);
-		}
-		else
+		// display error message on progress UI, may be closed immediately by APP, so we hide progress UI and call message_box ...
+		// 
+		//if (callback::show_progress_ui && is_bIndicator)
+		//{
+		//	int ev = SANE_EVENT_WORKING;
+		//
+		////	on_ui_event(ev, (void*)ev);
+		//	ui_notify(SANE_EVENT_SCAN_FINISHED, (void *)hg_scanner_err_description(ret), ret);
+		//}
+		//else
 		{
+			if (callback::close_ui)
+				callback::close_ui(UI_INDICATOR);
 
 			if (callback::show_messagebox_ui)
 			{