diff --git a/hgdriver/hgdev/hg_scanner.cpp b/hgdriver/hgdev/hg_scanner.cpp
index a9785d0..c9f3b1e 100644
--- a/hgdriver/hgdev/hg_scanner.cpp
+++ b/hgdriver/hgdev/hg_scanner.cpp
@@ -3358,7 +3358,9 @@ std::string hg_scanner::name(void)
 }
 int hg_scanner::status(void)
 {
-	if (!wait_usb_.is_waiting() || !wait_img_.is_waiting())
+	if (!online_)
+		return SCANNER_ERR_DEVICE_NOT_FOUND;
+	else if (!wait_usb_.is_waiting() || !wait_img_.is_waiting())
 		return SCANNER_ERR_DEVICE_BUSY;
 	else
 		return status_;
diff --git a/hgsane/sane_hg_mdw.cpp b/hgsane/sane_hg_mdw.cpp
index 32b2bb0..0b01482 100644
--- a/hgsane/sane_hg_mdw.cpp
+++ b/hgsane/sane_hg_mdw.cpp
@@ -1720,6 +1720,8 @@ SANE_Status hg_sane_middleware::set_option(SANE_Handle h, const void* option, SA
 	if (!handle || (action == SANE_ACTION_GET_VALUE && !value))
 		return SANE_STATUS_INVAL;
 
+	if (hg_scanner_get_status(handle, 0) == SCANNER_ERR_DEVICE_NOT_FOUND)
+		return local_utility::scanner_err_2_sane_statu(SCANNER_ERR_DEVICE_NOT_FOUND);
 
 	if (action == SANE_ACTION_GET_VALUE)
 	{