diff --git a/src/tsg_entry.cpp b/src/tsg_entry.cpp
index 6902f47..24cf918 100644
--- a/src/tsg_entry.cpp
+++ b/src/tsg_entry.cpp
@@ -740,13 +740,13 @@ int session_application_full_path_combine(struct gather_app_result *gather_resul
 	int offset=0,combined_num=0;
 	unsigned int combined_array[COMBINED_APP_ID_NUM]={0};
 
-	if(gather_result->l7_protocol_num>0)
+	if(gather_result->l7_protocol_num>=gather_result->l7_qm_engine_num)
 	{
 		combined_num+=copy_app_id(gather_result->l7_protocol, gather_result->l7_protocol_num, combined_array, COMBINED_APP_ID_NUM);
 	}
 	else
 	{
-		combined_num+=copy_app_id(gather_result->qm_engine, gather_result->l7_protocol_num, combined_array, COMBINED_APP_ID_NUM);
+		combined_num+=copy_app_id(gather_result->qm_engine, gather_result->l7_qm_engine_num, combined_array, COMBINED_APP_ID_NUM);
 	}
 
 	if(gather_result->matched_app_flag > 0)
@@ -765,10 +765,10 @@ int session_application_full_path_combine(struct gather_app_result *gather_resul
 	{
 		combined_num+=copy_app_id(gather_result->built_in, gather_result->built_in_num, combined_array+combined_num, COMBINED_APP_ID_NUM-combined_num);
 	}
-	else if(gather_result->qm_engine_num-gather_result->l7_protocol_num > 0)
+	else if(gather_result->qm_engine_num-gather_result->l7_qm_engine_num > 0)
 	{
-		combined_num+=copy_app_id(  gather_result->qm_engine + gather_result->l7_protocol_num,
-									gather_result->qm_engine_num - gather_result->l7_protocol_num, 
+		combined_num+=copy_app_id(  gather_result->qm_engine + gather_result->l7_qm_engine_num,
+									gather_result->qm_engine_num - gather_result->l7_qm_engine_num, 
 									combined_array+combined_num,
 									COMBINED_APP_ID_NUM-combined_num
 								);
diff --git a/test/bin/gtest_maat.json b/test/bin/gtest_maat.json
index 1694d91..8d14882 100644
--- a/test/bin/gtest_maat.json
+++ b/test/bin/gtest_maat.json
@@ -2311,6 +2311,10 @@
 	            "67\thttp\t0\tnull\tnetworking\tinfrastructure\tnetwork-protocol\t3\tused-by-malware,vulnerability,widely-used\tnull\tnull\t{\"method\":\"drop\",\"after_n_packets\":0,\"send_icmp_unreachable\":1,\"send_tcp_reset\":1}\t0\t60\t120\t30\t30\t1",
                 "68\thttps\t0\tnull\tnetworking\tinfrastructure\tnetwork-protocol\t3\tused-by-malware,vulnerability,widely-used\tnull\tnull\t{\"method\":\"rate_limit\",\"bps\":1000}\t0\t0\t0\t0\t0\t1",
                 "4\tunknown\t0\tnull\tcategory\tsubcategory\ttechnology\trisk\tcharacteristics\tnull\tnull\tnull\t1\t3600\t3600\t1800\t1800\t1",
+                "199\tssl\t0\tnull\tcategory\tsubcategory\ttechnology\trisk\tcharacteristics\tnull\tnull\tnull\t1\t3600\t3600\t1800\t1800\t1",
+                "240\tyoutube\t0\tnull\tcategory\tsubcategory\ttechnology\trisk\tcharacteristics\tnull\tnull\tnull\t1\t3600\t3600\t1800\t1800\t1",
+                "15009\tuser_define_youtube\t0\tnull\tcategory\tsubcategory\ttechnology\trisk\tcharacteristics\tnull\tnull\tnull\t1\t3600\t3600\t1800\t1800\t1",
+                "1500\tbuilt_in_youtube\t0\tnull\tcategory\tsubcategory\ttechnology\trisk\tcharacteristics\tnull\tnull\tnull\t1\t3600\t3600\t1800\t1800\t1",
                 "70\thttps\t1\tssl\tnetworking\tinfrastructure\tnetwork-protocol\t3\tused-by-malware,vulnerability,widely-used\tnull\tnull\t{\"method\":\"rate_limit\",\"bps\":1000}\t0\t0\t0\t0\t0\t1"
             ]
         },
diff --git a/test/src/gtest_master.cpp b/test/src/gtest_master.cpp
index 4a59f8f..157e251 100644
--- a/test/src/gtest_master.cpp
+++ b/test/src/gtest_master.cpp
@@ -1008,6 +1008,102 @@ TEST(TSGMaster, SessionApplicationMetrics)
 
 }
 
+extern int session_application_full_path_combine(struct gather_app_result * gather_result, char * out_full_path, int out_full_path_len);
+
+TEST(TSGMaster, SessionApplicationFullPath)
+{
+	char out_full_path[256]={0};
+	int out_full_path_len=sizeof(out_full_path);
+	struct gather_app_result gather_result={0};
+
+	gather_result.l7_protocol_num=1;
+	struct app_attributes l7_protocol={68, 0, 4};
+	gather_result.l7_protocol=&l7_protocol;
+
+	gather_result.qm_engine_num=3;
+	gather_result.l7_qm_engine_num=2;
+	struct app_attributes qm_engine[3]={{199, 0, 6}, {68, 0, 4}, {240, 0, 6}};
+	gather_result.qm_engine=qm_engine;
+
+	int offset=session_application_full_path_combine(&gather_result, out_full_path, out_full_path_len);
+	EXPECT_NE(0, offset);
+	EXPECT_STREQ("ssl.https.youtube", out_full_path);
+
+	// l7 protocol is empty
+	gather_result.l7_protocol_num=0;
+	gather_result.l7_protocol=NULL;
+
+	gather_result.qm_engine_num=3;
+	gather_result.l7_qm_engine_num=0;
+	struct app_attributes qm_engine2[3]={{199, 0, 6}, {68, 0, 4}, {240, 0, 6}};
+	gather_result.qm_engine=qm_engine2;
+
+	offset=session_application_full_path_combine(&gather_result, out_full_path, out_full_path_len);
+	EXPECT_NE(0, offset);
+	EXPECT_STREQ("ssl.https.youtube", out_full_path);
+
+	// matched application
+	gather_result.l7_protocol_num=1;
+	struct app_attributes l7_protocol_3={68, 0, 4};
+	gather_result.l7_protocol=&l7_protocol_3;
+
+	gather_result.qm_engine_num=3;
+	gather_result.l7_qm_engine_num=2;
+	struct app_attributes qm_engine3[3]={{199, 0, 6}, {68, 0, 4}, {240, 0, 6}};
+	gather_result.qm_engine=qm_engine3;
+
+	gather_result.matched_app_flag=1;
+	gather_result.matched_app={240, 0, 6};
+
+	struct app_attributes user_define_3={15009, 0, 4};
+	gather_result.user_define_num=1;
+	gather_result.user_define=&user_define_3;
+	
+	offset=session_application_full_path_combine(&gather_result, out_full_path, out_full_path_len);
+	EXPECT_NE(0, offset);
+	EXPECT_STREQ("ssl.https.youtube", out_full_path);
+
+	//userdefine application
+	gather_result.l7_protocol_num=1;
+	struct app_attributes l7_protocol_4={68, 0, 4};
+	gather_result.l7_protocol=&l7_protocol_4;
+
+	gather_result.qm_engine_num=3;
+	gather_result.l7_qm_engine_num=2;
+	struct app_attributes qm_engine4[3]={{199, 0, 6}, {68, 0, 4}, {240, 0, 6}};
+	gather_result.qm_engine=qm_engine4;
+
+	gather_result.matched_app_flag=0;
+
+	struct app_attributes user_define_4={15009, 0, 4};
+	gather_result.user_define_num=1;
+	gather_result.user_define=&user_define_4;
+	
+	offset=session_application_full_path_combine(&gather_result, out_full_path, out_full_path_len);
+	EXPECT_NE(0, offset);
+	EXPECT_STREQ("ssl.https.user_define_youtube", out_full_path);
+
+	// built in application
+	gather_result.l7_protocol_num=1;
+	struct app_attributes l7_protocol_5={68, 0, 4};
+	gather_result.l7_protocol=&l7_protocol_5;
+
+	gather_result.qm_engine_num=3;
+	gather_result.l7_qm_engine_num=2;
+	struct app_attributes qm_engine5[3]={{199, 0, 6}, {68, 0, 4}, {240, 0, 6}};
+	gather_result.qm_engine=qm_engine5;
+
+	gather_result.matched_app_flag=0;
+
+	struct app_attributes user_define_5={1500, 0, 4};
+	gather_result.user_define_num=1;
+	gather_result.user_define=&user_define_5;
+	
+	offset=session_application_full_path_combine(&gather_result, out_full_path, out_full_path_len);
+	EXPECT_NE(0, offset);
+	EXPECT_STREQ("ssl.https.built_in_youtube", out_full_path);
+}
+
 int main(int argc, char *argv[])
 {
 	TSG_MASTER_INIT();