diff --git a/user/module/probe_openssl.go b/user/module/probe_openssl.go
index 06f000d6f..ca48b2234 100644
--- a/user/module/probe_openssl.go
+++ b/user/module/probe_openssl.go
@@ -388,7 +388,7 @@ func (m *MOpenSSLProbe) saveMasterSecret(secretEvent *event.MasterSecretEvent) {
 	}
 
 	// save to file
-	var b *bytes.Buffer
+	var b = bytes.NewBuffer(nil)
 	switch secretEvent.Version {
 	case event.Tls12Version:
 		length := event.MasterSecretMaxLen
@@ -636,7 +636,6 @@ func (m *MOpenSSLProbe) Dispatcher(eventStruct event.IEventStruct) {
 	case *event.SSLDataEvent:
 		m.dumpSslData(eventStruct.(*event.SSLDataEvent))
 	}
-	m.logger.Debug().Msg("Dispatcher eventStruct")
 }
 
 func (m *MOpenSSLProbe) dumpSslData(eventStruct *event.SSLDataEvent) {
diff --git a/user/module/probe_pcap.go b/user/module/probe_pcap.go
index dcae3220b..840b89fbb 100644
--- a/user/module/probe_pcap.go
+++ b/user/module/probe_pcap.go
@@ -97,7 +97,7 @@ func (t *MTCProbe) dumpTcSkb(tcEvent *event.TcSkbEvent) error {
 		err, p := t.writePid(tcEvent)
 		if err == nil {
 			payload = p
-			t.logger.Debug().Uint32("pid", tcEvent.Pid).Str("comm", fmt.Sprintf("%s", tcEvent.Comm)).Str("cmdline", fmt.Sprintf("%s", tcEvent.Cmdline)).Msg("dumpTcSkb")
+			//t.logger.Debug().Uint32("pid", tcEvent.Pid).Str("comm", fmt.Sprintf("%s", tcEvent.Comm)).Str("cmdline", fmt.Sprintf("%s", tcEvent.Cmdline)).Msg("dumpTcSkb")
 		}
 	}
 	return t.writePacket(uint32(len(payload)), time.Unix(0, int64(timeStamp)), payload)
@@ -153,6 +153,9 @@ func (t *MTCProbe) savePcapng() (i int, err error) {
 	if err != nil {
 		return
 	}
+
+	// reset master key buffer, fix issue #542
+	t.masterKeyBuffer.Reset()
 	t.tcPacketLocker.Lock()
 	defer func() {
 		t.tcPacketLocker.Unlock()