diff --git a/deploy/zd-host.sh b/deploy/zd-host.sh
index 52778c8..91fd15a 100644
--- a/deploy/zd-host.sh
+++ b/deploy/zd-host.sh
@@ -18,8 +18,10 @@ VER="${1:?用法: deploy/zd-host.sh <version>}"
 TAG="homedash:ui-${VER}"
 STAMP="$(date +%Y%m%d%H%M%S)"
 
-[ -n "$HOST" ] || { echo "!! 请指定目标机：NAVI_HOST=user@host bash $0 ..." >&2; exit 2; }
 HOST="${NAVI_HOST:-}"   # 必填：NAVI_HOST=user@host（仓库不预置任何真实地址）
+
+# 必填校验要在赋值之后（set -u 下提前引用会直接 unbound variable）
+[ -n "$HOST" ] || { echo "!! 请指定目标机：NAVI_HOST=user@host bash $0 <版本>" >&2; exit 2; }
 SSH_PASS="${NAVI_SSH_PASS:-}"
 DATA_DIR="${NAVI_DATA_DIR:-/vol1/docker/navi-data}"
 CERT_DIR="${NAVI_CERT_DIR:-/vol1/docker/cert}"
diff --git a/deploy/zd.sh b/deploy/zd.sh
index 35a4097..b6a48f4 100755
--- a/deploy/zd.sh
+++ b/deploy/zd.sh
@@ -25,8 +25,10 @@ VER="${1:?用法: deploy/zd.sh <version>}"
 TAG="homedash:ui-${VER}"
 STAMP="$(date +%Y%m%d%H%M%S)"
 
-[ -n "$HOST" ] || { echo "!! 请指定目标机：NAVI_HOST=user@host bash $0 ..." >&2; exit 2; }
 HOST="${NAVI_HOST:-}"   # 必填：NAVI_HOST=user@host
+
+# 必填校验要在赋值之后（set -u 下提前引用会直接 unbound variable）
+[ -n "$HOST" ] || { echo "!! 请指定目标机：NAVI_HOST=user@host bash $0 <版本>" >&2; exit 2; }
 SSH_PASS="${NAVI_SSH_PASS:-}"
 UPSTREAM_HOST="${NAVI_UPSTREAM_HOST:-dashy.example.com}"
 PORTAL_CONF="${NAVI_PORTAL_CONF:-/vol1/docker/portal/nginx/nginx.conf}"