diff --git a/server/handler/payload_tcp_parser.go b/server/handler/payload_tcp_parser.go
index 6d3c4cc..f2e1c31 100644
--- a/server/handler/payload_tcp_parser.go
+++ b/server/handler/payload_tcp_parser.go
@@ -32,6 +32,9 @@ func sniNewParser(b []byte) (uint8, string) {
 	if len(b) < 2 || b[0] != 0x16 || b[1] != 0x03 {
 		return acc_proto_tcp, ""
 	}
+	if len(b) < 6 {
+		return acc_proto_tcp, ""
+	}	
 	rest := b[5:]
 	restLen := len(rest)
 	if restLen == 0 {