diff --git a/app/Dockerfile b/app/Dockerfile
index 7601036..625d4b7 100644
--- a/app/Dockerfile
+++ b/app/Dockerfile
@@ -33,14 +33,14 @@ ENV TTRSS_XDEBUG_PORT="9000"
 
 ENV TTRSS_DB_TYPE="pgsql"
 ENV TTRSS_DB_HOST="db"
-ENV TTRSS_DB_USER="%DB_USER"
-ENV TTRSS_DB_NAME="%DB_NAME"
-ENV TTRSS_DB_PASS="%DB_PASS"
+ENV TTRSS_DB_USER=""
+ENV TTRSS_DB_NAME=""
+ENV TTRSS_DB_PASS=""
 ENV TTRSS_DB_PORT="5432"
 
 # config.php defaults
 ENV TTRSS_MYSQL_CHARSET="UTF8"
-ENV TTRSS_SELF_URL_PATH="%SELF_URL_PATH"
+ENV TTRSS_SELF_URL_PATH=""
 ENV TTRSS_SINGLE_USER_MODE=""
 ENV TTRSS_SIMPLE_UPDATE_MODE=""
 ENV TTRSS_PHP_EXECUTABLE="/usr/bin/php8"
@@ -51,9 +51,6 @@ ENV TTRSS_ICONS_URL="feed-icons"
 ENV TTRSS_AUTH_AUTO_CREATE="true"
 ENV TTRSS_AUTH_AUTO_LOGIN="true"
 ENV TTRSS_FORCE_ARTICLE_PURGE="0"
-ENV TTRSS_ENABLE_REGISTRATION=""
-ENV TTRSS_REG_NOTIFY_ADDRESS="user@your.domain.dom"
-ENV TTRSS_REG_MAX_USERS="10"
 ENV TTRSS_SESSION_COOKIE_LIFETIME="86400"
 ENV TTRSS_SMTP_FROM_NAME="Tiny Tiny RSS"
 ENV TTRSS_SMTP_FROM_ADDRESS="noreply@your.domain.dom"
diff --git a/app/updater.sh b/app/updater.sh
index 60627e7..e3a5bb5 100755
--- a/app/updater.sh
+++ b/app/updater.sh
@@ -7,7 +7,7 @@ unset HTTP_HOST
 # wait for the app container to delete .app_is_ready and perform rsync, etc.
 sleep 30
 
-if ! id app; then
+if ! id app >/dev/null 2>&1; then
 	addgroup -g $OWNER_GID app
 	adduser -D -h /var/www/html -G app -u $OWNER_UID app
 fi