diff --git a/check_process b/check_process
index 31337ff..2e870a8 100644
--- a/check_process
+++ b/check_process
@@ -15,7 +15,7 @@
 		upgrade=1
 		backup_restore=1
 		multi_instance=0
-		wrong_user=1
+		wrong_user=0
 		wrong_path=1
 		incorrect_path=1
 		corrupt_source=0
diff --git a/scripts/backup b/scripts/backup
index de4bc01..696b8fc 100644
--- a/scripts/backup
+++ b/scripts/backup
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 # causes the shell to exit if any subcommand or pipeline returns a non-zero status
-set -e
+set -eu
 
 # Source YNH helpers
 source /usr/share/yunohost/helpers
@@ -9,7 +9,7 @@ source /usr/share/yunohost/helpers
 app="jappix"
 
 # Retrieve app settings
-domain=$(sudo yunohost app setting "$app" domain)
+domain=$(ynh_app_setting_set "$app" domain)
 
 # Save sources & data
 ynh_backup "/var/www/${app}" "sources"
diff --git a/scripts/install b/scripts/install
index 37dcd8d..6053e23 100644
--- a/scripts/install
+++ b/scripts/install
@@ -6,6 +6,7 @@
 # IMPORT GENERIC HELPERS
 #=================================================
 
+set -eu
 source .fonctions
 source /usr/share/yunohost/helpers
 
diff --git a/scripts/remove b/scripts/remove
index c9400c2..81aaaa8 100644
--- a/scripts/remove
+++ b/scripts/remove
@@ -1,5 +1,6 @@
 #!/bin/bash
 
+set -u
 source /usr/share/yunohost/helpers
 
 app="jappix"
diff --git a/scripts/upgrade b/scripts/upgrade
index 23eeee7..a38e177 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -1,6 +1,6 @@
 #!/bin/bash
 
-set -e
+set -eu
 source .fonctions
 source /usr/share/yunohost/helpers
 
@@ -12,12 +12,6 @@ path=$(ynh_app_setting_get $app path)
 name=$(ynh_app_setting_get "$app" name)
 language=$(ynh_app_setting_get "$app" language)
 
-# Retrieve arguments
-domain=$(ynh_app_setting_set "$app" domain)
-path=$(ynh_app_setting_set "$app" path)
-name=$(ynh_app_setting_set "$app" name)
-language=$(ynh_app_setting_set "$app" language)
-
 # Set default values
 name="${name:-YunoJappix}"
 language="${language:-en}"