diff --git a/main/ui/apps/iotdis/web/web_handlers.cpp b/main/ui/apps/iotdis/web/web_handlers.cpp
index 70de44d..f7f225a 100644
--- a/main/ui/apps/iotdis/web/web_handlers.cpp
+++ b/main/ui/apps/iotdis/web/web_handlers.cpp
@@ -21,16 +21,16 @@ esp_err_t WebHandler::start_web_server() {
 
   auth_key_ = generate_auth_key_();
 
-  esp_err_t ret = web_server_->start(
+  uint16_t port = web_server_->start(
     auth_key_,
     8080
   );
-  if (ret != ESP_OK) {
+  if (port == 0) {
     ESP_LOGE(TAG, "Failed to start web server");
-    return ret;
+    return ESP_FAIL;
   }
 
-  ret = register_web_endpoints_();
+  esp_err_t ret = register_web_endpoints_();
   if (ret != ESP_OK) {
     ESP_LOGE(TAG, "Failed to register web endpoints");
     web_server_->stop();