diff --git a/hgdriver/hgdev/hg_scanner.cpp b/hgdriver/hgdev/hg_scanner.cpp
index ee1c902..98f5fbd 100644
--- a/hgdriver/hgdev/hg_scanner.cpp
+++ b/hgdriver/hgdev/hg_scanner.cpp
@@ -1063,6 +1063,8 @@ void hg_scanner::thread_handle_image_process(void)
 	//VLDReportLeaks();
 	//while (run_ && !user_cancel_)
 	int cnt = 0;
+	bool invoke_stop = false;
+
 	while (run_)
 	{
 		std::shared_ptr<tiny_buffer> tiny_buffer;
@@ -1094,7 +1096,8 @@ void hg_scanner::thread_handle_image_process(void)
 					{
 						VLOG_MINI_1(LOG_LEVEL_FATAL, "[thread_handle_image_process]:Get Image Process is NULL  pid is %d.\n", pid_);
 						stop_fatal_ = SCANNER_ERR_INSUFFICIENT_MEMORY;
-						stop();
+						do_stop();
+						invoke_stop = true; 
 						break;
 					}
 				}
@@ -1110,7 +1113,8 @@ void hg_scanner::thread_handle_image_process(void)
 				else
 					stop_fatal_ = SCANNER_ERR_INSUFFICIENT_MEMORY;
 				VLOG_MINI_1(LOG_LEVEL_FATAL, "[thread_handle_image_process]:is opencv Fatal and stop scanner: %s\n", e.what());
-				stop();
+				do_stop();
+				invoke_stop = true;
 				break;
 
 			}
@@ -1118,7 +1122,9 @@ void hg_scanner::thread_handle_image_process(void)
 			{
 				VLOG_MINI_1(LOG_LEVEL_FATAL, "[thread_handle_image_process]:stop scanner!!! Insufficient memory when proecss image with %d bytes.\n", tiny_buffer->size());
 				stop_fatal_ = SCANNER_ERR_INSUFFICIENT_MEMORY;
-				stop();
+				do_stop();
+				invoke_stop = true;
+				break;
 			}
 		}
 		else
@@ -1128,6 +1134,15 @@ void hg_scanner::thread_handle_image_process(void)
 	}
 	LOG_INFO(LOG_LEVEL_DEBUG_INFO, "[thread_handle_image_process 'EXIT !!!']\n");
 	//VLDGlobalDisable();
+
+	// wait usb thread waiting ...
+	if (invoke_stop)	// break on exception, enusre me quit at last
+	{
+		int times = 0;
+		while (!wait_usb_.is_waiting() && times++ < 200)
+			std::this_thread::sleep_for(std::chrono::milliseconds(5));
+		imgs_.Clear();
+	}
 }
 void hg_scanner::working_begin(void*)
 {
@@ -3572,7 +3587,7 @@ std::shared_ptr<tiny_buffer> hg_scanner::aquire_memory(int size, bool from_usb)
 		mem.reset();
 		LOG_INFO(LOG_LEVEL_FATAL, "Can't aquire enough memory, working must be stopped!\n");
 		notify_ui_working_status(hg_log::lang_load(ID_STATU_DESC_SCANNER_ERR_INSUFFICIENT_MEMORY), SANE_EVENT_ERROR, SCANNER_ERR_INSUFFICIENT_MEMORY);
-		stop();
+		do_stop();
 	}
 
 	return mem;