diff --git a/src/gquic_process.cpp b/src/gquic_process.cpp
index 31159b9..630c467 100644
--- a/src/gquic_process.cpp
+++ b/src/gquic_process.cpp
@@ -691,6 +691,9 @@ int parse_extension_tag(struct streaminfo *pstream, struct _quic_stream **quic_s
 		stream->ext_tags=(quic_tlv_t *)dictator_malloc(pstream->threadnum, tag_num*sizeof(quic_tlv_t));
 		memset(stream->ext_tags, 0, tag_num*sizeof(quic_tlv_t));
 		*quic_stream=stream;
+		stream->sni_idx=0xFF;
+		stream->ver_idx=0xFF;
+		stream->ua_idx=0xFF;
 	}
 	else
 	{
@@ -700,6 +703,9 @@ int parse_extension_tag(struct streaminfo *pstream, struct _quic_stream **quic_s
 		*quic_stream=stream;
 		stream->ext_tag_num=0;
 		stream->count++;
+		stream->sni_idx=0xFF;
+		stream->ver_idx=0xFF;
+		stream->ua_idx=0xFF;
 	}
 
 	while(tag_num>tag_used_num)
@@ -1166,6 +1172,9 @@ int parse_encrypt_client_hello(struct streaminfo *pstream, struct _quic_stream *
 
 	quic_stream->ext_tags=(quic_tlv_t *)dictator_malloc(pstream->threadnum, sizeof(quic_tlv_t)*3);
 	memset(quic_stream->ext_tags, 0, sizeof(quic_tlv_t)*3);
+	quic_stream->sni_idx=0xFF;
+	quic_stream->ua_idx=0xFF;
+	quic_stream->ver_idx=0xFF;
 	
 	while(extension_total_len>used_len)
 	{
@@ -1364,10 +1373,17 @@ int quic_protocol_identify(struct streaminfo *a_stream, void *a_packet, char *ou
 	{
 		if(_context->quic_info.client_hello!=NULL)
 		{
-			sni=(char *)(_context->quic_info.client_hello->ext_tags[_context->quic_info.client_hello->sni_idx].value);
-			sni_len=_context->quic_info.client_hello->ext_tags[_context->quic_info.client_hello->sni_idx].length;
-			len= sni_len>(out_sni_len-1) ? (out_sni_len-1) : sni_len;
-			memcpy(out_sni, sni, len);
+			if(_context->quic_info.client_hello->sni_idx!=0xFF)
+			{
+				sni=(char *)(_context->quic_info.client_hello->ext_tags[_context->quic_info.client_hello->sni_idx].value);
+				sni_len=_context->quic_info.client_hello->ext_tags[_context->quic_info.client_hello->sni_idx].length;
+				len= sni_len>(out_sni_len-1) ? (out_sni_len-1) : sni_len;
+				memcpy(out_sni, sni, len);
+			}
+			else
+			{
+				len=0;
+			}
 		}
 		else
 		{
diff --git a/test/pcap/gquic/43/2-gquic-043-without-sni-192.168.50.26.55209-34.102.215.99.443.pcap b/test/pcap/gquic/43/2-gquic-043-without-sni-192.168.50.26.55209-34.102.215.99.443.pcap
new file mode 100644
index 0000000..ae75b00
Binary files /dev/null and b/test/pcap/gquic/43/2-gquic-043-without-sni-192.168.50.26.55209-34.102.215.99.443.pcap differ
diff --git a/test/pcap/gquic/43/3-gquic-043-without-sni-192.168.50.26.60851-34.102.215.99.443.pcap b/test/pcap/gquic/43/3-gquic-043-without-sni-192.168.50.26.60851-34.102.215.99.443.pcap
new file mode 100644
index 0000000..3bad2e1
Binary files /dev/null and b/test/pcap/gquic/43/3-gquic-043-without-sni-192.168.50.26.60851-34.102.215.99.443.pcap differ
diff --git a/test/pcap/gquic/43/quic_result.json b/test/pcap/gquic/43/quic_result.json
index e50c842..278622f 100644
--- a/test/pcap/gquic/43/quic_result.json
+++ b/test/pcap/gquic/43/quic_result.json
@@ -1,6 +1,18 @@
 [{
+		"Tuple4":	"192.168.50.26.55209>34.102.215.99.443",
+		"VERSION":	"Google QUIC 43",
+		"name":	"QUIC_RESULT_1"
+	}, {
+		"Tuple4":	"192.168.50.26.60851>34.102.215.99.443",
+		"VERSION":	"Google QUIC 43",
+		"name":	"QUIC_RESULT_2"
+	}, {
 		"Tuple4":	"112.43.145.231.18699>112.46.25.216.443",
 		"VERSION":	"Google QUIC 43",
 		"SNI":	"client.weixin.qq.com",
-		"name":	"QUIC_RESULT_1"
+		"name":	"QUIC_RESULT_3"
+	}, {
+		"Tuple4":	"192.168.50.26.63533>34.102.215.99.443",
+		"VERSION":	"Google QUIC 43",
+		"name":	"QUIC_RESULT_4"
 }]