diff --git a/server/handler/payload_tcp_parser.go b/server/handler/payload_tcp_parser.go
index cd0e581..6d3c4cc 100644
--- a/server/handler/payload_tcp_parser.go
+++ b/server/handler/payload_tcp_parser.go
@@ -56,7 +56,7 @@ func sniNewParser(b []byte) (uint8, string) {
 	sessionIDLength := int(rest[current])
 	current += 1
 	current += sessionIDLength
-	if current >= restLen {
+	if current+1 >= restLen {
 		return acc_proto_https, ""
 	}
 	cipherSuiteLength := (int(rest[current]) << 8) + int(rest[current+1])