diff --git a/config_panel.toml b/config_panel.toml
index 9d2c82a..559c717 100644
--- a/config_panel.toml
+++ b/config_panel.toml
@@ -13,7 +13,7 @@ name = "Mediawiki configuration"
         yes = true
         no = false
         help = "Set to 'true' to allow account creation."
-        bind = "create_account:__INSTALL_DIR__/LocalSettings.php"
+        bind = "createaccount:__INSTALL_DIR__/LocalSettings.php"
 
     [main.php_fpm_config]
     name = "PHP-FPM configuration"
diff --git a/scripts/upgrade b/scripts/upgrade
index f96a91b..70f828d 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -35,7 +35,7 @@ if [ -z "${fpm_usage:-}" ]; then
 fi
 
 # If create_account doesn't exist, create it
-if [ -z "$create_account" ]; then
+if [ -z "${create_account:-}" ]; then
 	create_account=false
 	ynh_app_setting_set --app=$app --key=create_account --value=$create_account
 fi