diff --git a/backend/package.json b/backend/package.json
index c53d488..ff849b1 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -1,6 +1,6 @@
 {
   "name": "sub-store",
-  "version": "2.14.222",
+  "version": "2.14.223",
   "description": "Advanced Subscription Manager for QX, Loon, Surge, Stash and ShadowRocket.",
   "main": "src/main.js",
   "scripts": {
diff --git a/backend/src/core/proxy-utils/producers/sing-box.js b/backend/src/core/proxy-utils/producers/sing-box.js
index bef9a98..77bd068 100644
--- a/backend/src/core/proxy-utils/producers/sing-box.js
+++ b/backend/src/core/proxy-utils/producers/sing-box.js
@@ -178,8 +178,8 @@ const grpcParser = (proxy, parsedProxy) => {
     const transport = { type: 'grpc' };
     if (proxy['grpc-opts']) {
         const serviceName = proxy['grpc-opts']['grpc-service-name'];
-        if (serviceName && serviceName !== '')
-            transport.service_name = serviceName;
+        if (serviceName != null && serviceName !== '')
+            transport.service_name = `${serviceName}`;
     }
     parsedProxy.transport = transport;
 };