diff --git a/manifest.json b/manifest.json
index 4b9eb4f..f9e059d 100644
--- a/manifest.json
+++ b/manifest.json
@@ -6,7 +6,7 @@
         "en": "An advanced https proxy allowing you to call other websites from your own web application.",
         "fr": "Un proxy https avancé vous permettant d'appeler d'autres sites depuis votre propre application web."
     },
-    "version": "1.2.0~ynh1",
+    "version": "1.2.0~ynh2",
     "url": "https://github.com/gcollin/cookie-aware-cors-proxy",
     "upstream": {
         "license": "MIT",
diff --git a/scripts/backup b/scripts/backup
index 26b95b8..9737690 100755
--- a/scripts/backup
+++ b/scripts/backup
@@ -30,6 +30,7 @@ app=$YNH_APP_INSTANCE_NAME
 
 final_path=$(ynh_app_setting_get --app=$app --key=final_path)
 domain=$(ynh_app_setting_get --app=$app --key=domain)
+public_key=$(ynh_app_setting_get --app=$app --key=public_key)
 
 #=================================================
 # DECLARE DATA AND CONF FILES TO BACKUP
@@ -56,8 +57,10 @@ ynh_backup --src_path="/etc/nginx/conf.d/$domain.d/$app.conf"
 #=================================================
 # SPECIFIC BACKUP
 #=================================================
-ynh_backup --src_path="/etc/sudoers.d/$app-sudoers"
-
+if [ -n "$public_key" ]
+then
+  ynh_backup --src_path="/etc/sudoers.d/$app-sudoers"
+fi
 # BACKUP LOGROTATE
 #=================================================
 
diff --git a/scripts/upgrade b/scripts/upgrade
index 66d1d60..ff0d7e5 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -38,17 +38,24 @@ upgrade_type=$(ynh_check_app_version_changed)
 #=================================================
 # BACKUP BEFORE UPGRADE THEN ACTIVE TRAP
 #=================================================
-ynh_script_progression --message="Backing up the app before upgrading (may take a while)..." --weight=1
+# There is an issue in previous backup file in case of non public_key, so backup only in case of public_key
+if [ -n "$public_key" ]
+then
+
+  ynh_script_progression --message="Backing up the app before upgrading (may take a while)..." --weight=1
+
+  # Backup the current version of the app
+  ynh_backup_before_upgrade
+  ynh_clean_setup () {
+    # Restore it if the upgrade fails
+    ynh_restore_upgradebackup
+  }
+fi
 
-# Backup the current version of the app
-ynh_backup_before_upgrade
-ynh_clean_setup () {
-	# Restore it if the upgrade fails
-	ynh_restore_upgradebackup
-}
 # Exit if an error occurs during the execution of the script
 ynh_abort_if_errors
 
+
 #=================================================
 # STANDARD UPGRADE STEPS
 #=================================================