diff --git a/hgdriver/hgdev/hg_scanner.cpp b/hgdriver/hgdev/hg_scanner.cpp
index 670327f..7282733 100644
--- a/hgdriver/hgdev/hg_scanner.cpp
+++ b/hgdriver/hgdev/hg_scanner.cpp
@@ -347,12 +347,15 @@ void hg_scanner::thread_devslock_handle(void)
 }
 void hg_scanner::thread_read_int(void)
 {
-	wait_read_int.wait();
-	is_read_int = true;
-	notify_ui_working_status(STATU_DESC_SCANNER_ERR_DEVICE_DEVS_BOOTING, SANE_EVENT_STATUS, status_);
-	discard_all_images();
-	is_read_int = false;
-	notify_ui_working_status(STATU_DESC_SCANNER_ERR_DEVICE_DEVS_START_SUCCES, SANE_EVENT_STATUS, status_);
+	if (run_)
+	{
+		wait_read_int.wait();
+		is_read_int = true;
+		notify_ui_working_status(STATU_DESC_SCANNER_ERR_DEVICE_DEVS_BOOTING, SANE_EVENT_STATUS, status_);
+		discard_all_images();
+		is_read_int = false;
+		notify_ui_working_status(STATU_DESC_SCANNER_ERR_DEVICE_DEVS_START_SUCCES, SANE_EVENT_STATUS, status_);
+	}
 }
 void hg_scanner::thread_handle_usb(void)
 {