diff --git a/src/quic_entry.cpp b/src/quic_entry.cpp
index 7fbed33..9fee0d1 100644
--- a/src/quic_entry.cpp
+++ b/src/quic_entry.cpp
@@ -321,6 +321,8 @@ extern "C" long long QUIC_FLAG_CHANGE(char* flag_str)
 
 extern "C" void QUIC_DESTROY(void)
 {
+	MESA_destroy_runtime_log_handle(g_quic_param.logger);
+	g_quic_param.logger = NULL;
 	return ;
 }
 
diff --git a/src/quic_process.cpp b/src/quic_process.cpp
index 711cf15..fe86a46 100644
--- a/src/quic_process.cpp
+++ b/src/quic_process.cpp
@@ -737,6 +737,11 @@ enum QUIC_VERSION is_quic_protocol(const char *payload, int payload_len, int *pa
 	enum QUIC_VERSION quic_version=QUIC_VERSION_UNKNOWN;
 	unsigned char frame_type=(unsigned char)(payload[0]);
 
+	if(payload_len<=4)
+	{
+		return QUIC_VERSION_UNKNOWN;
+	}
+
 	if(frame_type&QUIC_LONG_HEADER_MASK)
 	{
 		quic_version=identify_quic_version(payload, payload_len, payload_offset);