diff --git a/scripts/upgrade b/scripts/upgrade
index 6e129f8..4e0c836 100755
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -15,9 +15,6 @@ source /usr/share/yunohost/helpers
 ynh_script_progression --message="Loading installation settings..." --weight=3
 
 user_home=$(ynh_app_setting_get --app=$app --key=user_home)
-maintenance_mode=$(ynh_app_setting_get --app=$app --key=maintenance_mode)
-fpm_footprint=$(ynh_app_setting_get --app=$app --key=fpm_footprint)
-fpm_usage=$(ynh_app_setting_get --app=$app --key=fpm_usage)
 
 #=================================================
 # CHECK VERSION
@@ -34,35 +31,29 @@ ynh_script_progression --message="Ensuring downward compatibility..."
 ynh_app_setting_delete --app=$app --key=backup_core_only
 
 # If maintenance_mode doesn't exist, create it
-if [ -z "$maintenance_mode" ]; then
+if [ -z "${maintenance_mode:-}" ]; then
 	maintenance_mode=0
 	ynh_app_setting_set --app=$app --key=maintenance_mode --value=$maintenance_mode
 fi
 
 # If fpm_footprint doesn't exist, create it
-if [ -z "$fpm_footprint" ]; then
+if [ -z "${fpm_footprint:-}" ]; then
 	fpm_footprint=high
 	ynh_app_setting_set --app=$app --key=fpm_footprint --value=$fpm_footprint
 fi
 
 # If fpm_free_footprint doesn't exist, create it
-if [ -z "$fpm_free_footprint" ]; then
+if [ -z "${fpm_free_footprint:-}" ]; then
 	fpm_free_footprint=0
 	ynh_app_setting_set --app=$app --key=fpm_free_footprint --value=$fpm_free_footprint
 fi
 
 # If fpm_usage doesn't exist, create it
-if [ -z "$fpm_usage" ]; then
+if [ -z "${fpm_usage:-}" ]; then
 	fpm_usage=medium
 	ynh_app_setting_set --app=$app --key=fpm_usage --value=$fpm_usage
 fi
 
-
-# Create a permission if needed
-#if ! ynh_permission_exists --permission="api"; then
-#     ynh_permission_create --permission="api" --label="api" --url="re:$domain\/.well-known\/.*" --allowed="visitors" "all_users" --auth_header="false" --show_tile="false" --protected="true"
-#fi
-
 # Delete existing ini configuration file (backward compatibility)
 if [ -f /etc/php/$YNH_PHP_VERSION/fpm/conf.d/20-$app.ini ]; then
     ynh_secure_remove --file=/etc/php/$YNH_PHP_VERSION/fpm/conf.d/20-$app.ini