diff --git a/tools/addon/nextcloud-exporter.sh b/tools/addon/nextcloud-exporter.sh
index ca7b7d1b1..13a99aee1 100644
--- a/tools/addon/nextcloud-exporter.sh
+++ b/tools/addon/nextcloud-exporter.sh
@@ -125,9 +125,9 @@ function install() {
   cat <<EOF >"$CONFIG_PATH"
 # https://github.com/xperimental/nextcloud-exporter
 NEXTCLOUD_SERVER="${NEXTCLOUD_SERVER}"
-NEXTCLOUD_AUTH_TOKEN="${NEXTCLOUD_AUTH_TOKEN}"
-NEXTCLOUD_USERNAME="${NEXTCLOUD_USERNAME}"
-NEXTCLOUD_PASSWORD="${NEXTCLOUD_PASSWORD}"
+NEXTCLOUD_AUTH_TOKEN="${NEXTCLOUD_AUTH_TOKEN:-}"
+NEXTCLOUD_USERNAME="${NEXTCLOUD_USERNAME:-}"
+NEXTCLOUD_PASSWORD="${NEXTCLOUD_PASSWORD:-}"
 NEXTCLOUD_INFO_UPDATE=${NEXTCLOUD_INFO_UPDATE:-"true"}
 NEXTCLOUD_INFO_APPS=${NEXTCLOUD_INFO_APPS:-"true"}
 NEXTCLOUD_TLS_SKIP_VERIFY=${NEXTCLOUD_TLS_SKIP_VERIFY:-"false"}