diff --git a/scripts/upgrade b/scripts/upgrade
index 3b7a875..4691ba2 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -38,31 +38,23 @@ fi
 fi 
 
 # If fpm_footprint doesn't exist, create it
-if [ -z "$fpm_footprint" ]; then
+if [ -z "${fpm_footprint:-}" ]; then
     fpm_footprint=low
     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=low
     ynh_app_setting_set --app=$app --key=fpm_usage --value=$fpm_usage
 fi
 
-#=================================================
-# CREATE DEDICATED USER
-#=================================================
-#REMOVEME? ynh_script_progression --message="Making sure dedicated system user exists..." --weight=1
-
-# Create a dedicated user (if not existing)
-#REMOVEME? ynh_system_user_create --username=$app --home_dir="$install_dir"
-
 #=================================================
 # STANDARD UPGRADE STEPS
 #=================================================