diff --git a/scripts/upgrade b/scripts/upgrade
index f9efe55..45798a8 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 source ./_common
-
+set -eu
 app=$YNH_APP_INSTANCE_NAME
 
 domain=$(sudo ynh_app_setting_set $app domain)