diff --git a/.gitignore b/.gitignore
index 1f9b508..e420459 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,7 +6,7 @@ Debug
 .project
 .settings/
 SI
-build/
+build*/
 src/inc
 src/lib64
 cmake-build-*/
diff --git a/src/quic_process.cpp b/src/quic_process.cpp
index 4b677c6..076001e 100644
--- a/src/quic_process.cpp
+++ b/src/quic_process.cpp
@@ -100,6 +100,12 @@ static int copy_extension_tag(const char *tag_start_pos, int tag_len, char **out
 {
 	if(tag_start_pos!=NULL && tag_len>0)
 	{
+		if(*out!=NULL)
+		{
+			dictator_free(thread_seq, *out);
+			*out=NULL;
+		}
+
 		(*out)=(char *)dictator_malloc(thread_seq, tag_len+1);
 		memcpy(*out, tag_start_pos, tag_len);
 		(*out)[tag_len]='\0';
@@ -310,9 +316,12 @@ int parse_special_frame_stream(struct quic_info* quic_info, const char *payload,
 		return PARSE_RESULT_VERSION;
 	}
 
-	quic_info->client_hello=(struct quic_client_hello *)dictator_malloc(thread_seq, sizeof(struct quic_client_hello));
-	memset(quic_info->client_hello, 0, sizeof(struct quic_client_hello));
-	
+	if(quic_info->client_hello==NULL)
+	{
+		quic_info->client_hello=(struct quic_client_hello *)dictator_malloc(thread_seq, sizeof(struct quic_client_hello));
+		memset(quic_info->client_hello, 0, sizeof(struct quic_client_hello));
+	}
+
 	tag_value_start_offset=payload_offset+tag_num*4*2;  // skip length of type and offset, type(offset)=szieof(int)
 
 	while(tag_num>pass_tag_num)