diff --git a/scripts/.fonctions b/scripts/.fonctions
index 5268a86..d04f9e3 100644
--- a/scripts/.fonctions
+++ b/scripts/.fonctions
@@ -203,6 +203,38 @@ BACKUP_BEFORE_UPGRADE () {	# Backup the current version of the app, restore it i
 	fi
 }
 
+# Manage a fail of the script
+#
+# Print a warning to inform that the script was failed
+# Execute the ynh_clean_setup function if used in the app script
+#
+# usage of ynh_clean_setup function
+# This function provide a way to clean some residual of installation that not managed by remove script.
+# To use it, simply add in your script:
+# ynh_clean_setup () {
+#        instructions...
+# }
+# This function is optionnal.
+#
+# Usage: ynh_exit_properly is used only by the helper ynh_check_error.
+# You must not use it directly.
+ynh_exit_properly () {
+	exit_code=$?
+	if [ "$exit_code" -eq 0 ]; then
+			exit 0	# Exit without error if the script ended correctly
+	fi
+
+	trap '' EXIT	# Ignore new exit signals
+	set +eu	# Do not exit anymore if a command fail or if a variable is empty
+
+	echo -e "!!\n  $app's script has encountered an error. Its execution was cancelled.\n!!" >&2
+
+	if type -t ynh_clean_setup > /dev/null; then	# Check if the function exist in the app script.
+		ynh_clean_setup	# Call the function to do specific cleaning for the app.
+	fi
+
+	ynh_die	# Exit with error status
+}
 
 # Exit if an error occurs during the execution of the script.
 #
diff --git a/scripts/upgrade b/scripts/upgrade
index 7c55d10..c25a5a7 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -83,7 +83,7 @@ fi
 CHECK_MD5_CONFIG "lufi.conf" "$final_path/lufi.conf"	# Créé un backup du fichier de config si il a été modifié.
 sudo cp ../conf/lufi.conf.template "$final_path/lufi.conf"
 sudo sed -i "s@__DOMAIN__@$domain@g" "$final_path/lufi.conf"
-sudo sed -i "s@__PATH__@$path_url@g" "$final_path/lufi.conf"
+sudo sed -i "s@__PATH__@$path@g" "$final_path/lufi.conf"
 sudo sed -i "s@__PORT__@$port@g" "$final_path/lufi.conf"
 sudo sed -i "s@__SECRET__@$secret@g" "${final_path}/lufi.conf"
 STORE_MD5_CONFIG "lufi.conf" "$final_path/lufi.conf"	# Réenregistre la somme de contrôle du fichier de config
@@ -113,7 +113,7 @@ sudo sed -i "s@__FINALPATH__@$final_path/@g" /etc/cron.d/$app
 #=================================================
 
 pushd $final_path	# cd avec une stack pour revenir en arrière
-sudo carton install 2>&1 | sudo tee -a "/var/log/$app/setup_carton.log"
+echo yes | sudo carton install 2>&1 | sudo tee -a "/var/log/$app/setup_carton.log"
 popd	# Revient au dossier courant avant pushd
 
 #=================================================