diff --git a/telegram.yaml b/telegram.yaml
index caafe9a..20643ee 100644
--- a/telegram.yaml
+++ b/telegram.yaml
@@ -1,5 +1,5 @@
 serial:
-  device: ttyS1
+  device: /tmp/ttyS1
   baudrate: 9600
   #bytesize: 8
   # 1, 2, 15
@@ -22,4 +22,4 @@ pulsar:
 
 telegram:
   tcp: false
-  pulsar: true
\ No newline at end of file
+  pulsar: true
diff --git a/utils/pulsar.go b/utils/pulsar.go
index 83f4bf1..96ec52c 100644
--- a/utils/pulsar.go
+++ b/utils/pulsar.go
@@ -56,5 +56,7 @@ func PulsarSend(data string) error {
 
 func ClosePulsar() {
 	producer.Close()
-	client.Close()
+	if client != nil {
+		client.Close()
+	}
 }