diff --git a/src/operations.c b/src/operations.c
index 88a7a59..2c28228 100644
--- a/src/operations.c
+++ b/src/operations.c
@@ -80,7 +80,8 @@ struct device_info * dev_detect(void) {
 	}
 
 clean:
-	usb_close_device(usb);
+	if (usb)
+		usb_close_device(usb);
 	free(dev);
 	return NULL;