diff --git a/scripts/buildx-zh b/scripts/buildx-zh
index 506ca30..6a14467 100644
--- a/scripts/buildx-zh
+++ b/scripts/buildx-zh
@@ -9,7 +9,7 @@ cd "${DIR}/../.."
 docker buildx create --name "Buildx-NPM" || echo
 docker buildx use "Buildx-NPM"
 
-if [ $BUILD_TAG ];then
+if [ "${BUILD_TAG:-0}" != 0 ]; then
 	docker buildx build -f docker/Dockerfile-zh $BUILD_TAG --platform $BUILD_PLATFORM . --push
 else
 	docker buildx build -f docker/Dockerfile-zh -t "chishin/nginx-proxy-manager-zh:dev" --platform linux/amd64,linux/arm64,linux/arm/7 . --push