diff --git a/server/lib/snowflake.go b/server/lib/snowflake.go
index 4078358..c4d3fbc 100644
--- a/server/lib/snowflake.go
+++ b/server/lib/snowflake.go
@@ -125,13 +125,15 @@ func (t *Transport) Listen(addr net.Addr, numKCPInstances int) (*SnowflakeListen
 			errChan <- err
 		}
 	}()
-
 	select {
 	case err = <-errChan:
 		break
 	case <-time.After(listenAndServeErrorTimeout):
 		break
 	}
+	if err != nil {
+		return nil, err
+	}
 
 	listener.server = server