diff --git a/src/session/session_manager.cpp b/src/session/session_manager.cpp
index 7d51a26..c715167 100644
--- a/src/session/session_manager.cpp
+++ b/src/session/session_manager.cpp
@@ -567,13 +567,13 @@ static void session_manager_evicte_session(struct session_manager *mgr, struct s
      {
      case SESSION_TYPE_TCP:
           SESSION_LOG_DEBUG("evicte tcp old session: %lu", session_get_id(sess));
-          session_table_del(mgr->tcp_sess_table, session_get_tuple(sess));
+          session_table_del(mgr->tcp_sess_table, sess);
           SESS_MGR_STAT_UPDATE(&mgr->stat, curr_state, next_state, tcp);
           mgr->stat.nr_tcp_sess_evicted++;
           break;
      case SESSION_TYPE_UDP:
           SESSION_LOG_DEBUG("evicte udp old session: %lu", session_get_id(sess));
-          session_table_del(mgr->udp_sess_table, session_get_tuple(sess));
+          session_table_del(mgr->udp_sess_table, sess);
           if (mgr->opts.evicted_session_filter_enable)
           {
                evicted_session_filter_add(mgr->evicte_sess_filter, session_get_tuple(sess), now);
@@ -629,7 +629,7 @@ static struct session *session_manager_new_tcp_session(struct session_manager *m
 
      uint64_t timeout = (flags & TH_ACK) ? mgr->opts.tcp_handshake_timeout : mgr->opts.tcp_init_timeout;
      session_timer_update(mgr->sess_timer, sess, now + timeout);
-     session_table_add(mgr->tcp_sess_table, key, sess);
+     session_table_add(mgr->tcp_sess_table, sess);
 
      if (mgr->opts.duplicated_packet_filter_enable)
      {
@@ -666,7 +666,7 @@ static struct session *session_manager_new_udp_session(struct session_manager *m
      session_transition_log(sess, SESSION_STATE_INIT, next_state, UDP_DATA);
 
      session_timer_update(mgr->sess_timer, sess, now + mgr->opts.udp_data_timeout);
-     session_table_add(mgr->udp_sess_table, key, sess);
+     session_table_add(mgr->udp_sess_table, sess);
 
      SESS_MGR_STAT_INC(&mgr->stat, next_state, udp);
      mgr->stat.nr_udp_sess_used++;
@@ -918,12 +918,18 @@ void session_manager_free_session(struct session_manager *mgr, struct session *s
           {
           case SESSION_TYPE_TCP:
                tcp_clean(mgr, sess);
-               session_table_del(mgr->tcp_sess_table, session_get_tuple(sess));
+               if (session_table_find_sessid(mgr->tcp_sess_table, session_get_id(sess)) == sess)
+               {
+                    session_table_del(mgr->tcp_sess_table, sess);
+               }
                SESS_MGR_STAT_DEC(&mgr->stat, session_get_state(sess), tcp);
                mgr->stat.nr_tcp_sess_used--;
                break;
           case SESSION_TYPE_UDP:
-               session_table_del(mgr->udp_sess_table, session_get_tuple(sess));
+               if (session_table_find_sessid(mgr->udp_sess_table, session_get_id(sess)) == sess)
+               {
+                    session_table_del(mgr->udp_sess_table, sess);
+               }
                SESS_MGR_STAT_DEC(&mgr->stat, session_get_state(sess), udp);
                mgr->stat.nr_udp_sess_used--;
                break;
diff --git a/src/session/session_table.cpp b/src/session/session_table.cpp
index 4d478b3..bd62db7 100644
--- a/src/session/session_table.cpp
+++ b/src/session/session_table.cpp
@@ -139,16 +139,11 @@ void session_table_set_freecb(struct session_table *table, session_free_cb free_
     }
 }
 
-int session_table_add(struct session_table *table, const struct tuple6 *tuple, struct session *sess)
+void session_table_add(struct session_table *table, struct session *sess)
 {
     if (table == NULL || sess == NULL)
     {
-        return -1;
-    }
-
-    if (session_table_find_tuple6(table, tuple))
-    {
-        return -1;
+        return;
     }
 
     HASH_ADD(hh1, table->root_tuple6, tuple, sizeof(struct tuple6), sess);
@@ -156,19 +151,11 @@ int session_table_add(struct session_table *table, const struct tuple6 *tuple, s
     HASH_ADD(hh3, table->root_sessid, id, sizeof(uint64_t), sess);
     list_add_tail(&sess->lru, &table->lru_queue);
     table->count++;
-
-    return 0;
 }
 
-void session_table_del(struct session_table *table, const struct tuple6 *tuple)
+void session_table_del(struct session_table *table, struct session *sess)
 {
-    if (table == NULL)
-    {
-        return;
-    }
-
-    struct session *sess = session_table_find_tuple6(table, tuple);
-    if (sess == NULL)
+    if (table == NULL || sess == NULL)
     {
         return;
     }
diff --git a/src/session/session_table.h b/src/session/session_table.h
index bb485e6..a4751ff 100644
--- a/src/session/session_table.h
+++ b/src/session/session_table.h
@@ -15,10 +15,8 @@ uint64_t session_table_get_count(struct session_table *table);
 
 typedef void (*session_free_cb)(struct session *sess, void *arg);
 void session_table_set_freecb(struct session_table *table, session_free_cb free_cb, void *arg);
-// return  0: success
-// return -1: failed
-int session_table_add(struct session_table *table, const struct tuple6 *tuple, struct session *sess);
-void session_table_del(struct session_table *table, const struct tuple6 *tuple);
+void session_table_add(struct session_table *table, struct session *sess);
+void session_table_del(struct session_table *table, struct session *sess);
 struct session *session_table_find_sessid(struct session_table *table, uint64_t id);
 struct session *session_table_find_tuple6(struct session_table *table, const struct tuple6 *tuple);
 struct session *session_table_find_tuple4(struct session_table *table, const struct tuple4 *tuple);
diff --git a/src/session/test/gtest_session_table.cpp b/src/session/test/gtest_session_table.cpp
index 72972af..477766f 100644
--- a/src/session/test/gtest_session_table.cpp
+++ b/src/session/test/gtest_session_table.cpp
@@ -124,11 +124,11 @@ TEST(SESSION_TABLE, OP_SESSION)
     session_set_id(sess3, 3);
     session_set_tuple(sess3, &sess3_tup6);
 
-    EXPECT_TRUE(session_table_add(sess_table, &sess1_tup6, sess1) == 0);
+    session_table_add(sess_table, sess1);
     EXPECT_TRUE(session_table_get_count(sess_table) == 1);
-    EXPECT_TRUE(session_table_add(sess_table, &sess2_tup6, sess2) == 0);
+    session_table_add(sess_table, sess2);
     EXPECT_TRUE(session_table_get_count(sess_table) == 2);
-    EXPECT_TRUE(session_table_add(sess_table, &sess3_tup6, sess3) == 0);
+    session_table_add(sess_table, sess3);
     EXPECT_TRUE(session_table_get_count(sess_table) == 3);
 
     // Search
@@ -153,17 +153,17 @@ TEST(SESSION_TABLE, OP_SESSION)
     EXPECT_TRUE(session_table_find_tuple6(sess_table, &sess3_rev_tup6) == sess3);
 
     // Delete
-    session_table_del(sess_table, &sess1_tup6);
+    session_table_del(sess_table, sess1);
     EXPECT_TRUE(session_table_get_count(sess_table) == 2);
     EXPECT_TRUE(session_table_find_tuple6(sess_table, &sess1_tup6) == NULL);
     EXPECT_TRUE(session_table_find_tuple6(sess_table, &sess1_rev_tup6) == NULL);
 
-    session_table_del(sess_table, &sess2_rev_tup6);
+    session_table_del(sess_table, sess2);
     EXPECT_TRUE(session_table_get_count(sess_table) == 1);
     EXPECT_TRUE(session_table_find_tuple6(sess_table, &sess2_tup6) == NULL);
     EXPECT_TRUE(session_table_find_tuple6(sess_table, &sess2_rev_tup6) == NULL);
 
-    session_table_del(sess_table, &sess3_tup6);
+    session_table_del(sess_table, sess3);
     EXPECT_TRUE(session_table_get_count(sess_table) == 0);
     EXPECT_TRUE(session_table_find_tuple6(sess_table, &sess3_tup6) == NULL);
     EXPECT_TRUE(session_table_find_tuple6(sess_table, &sess3_rev_tup6) == NULL);
@@ -207,32 +207,32 @@ TEST(SESSION_TABLE, FIND_OLDEST_NEWEST)
     EXPECT_TRUE(sess1 != NULL);
     session_set_id(sess1, 1);
     session_set_tuple(sess1, &sess1_tup6);
-    EXPECT_TRUE(session_table_add(sess_table, &sess1_tup6, sess1) == 0);
+    session_table_add(sess_table, sess1);
     EXPECT_TRUE(session_table_find_lru(sess_table) == sess1);
 
     sess2 = session_pool_pop(sess_pool);
     EXPECT_TRUE(sess2 != NULL);
     session_set_id(sess2, 2);
     session_set_tuple(sess2, &sess2_tup6);
-    EXPECT_TRUE(session_table_add(sess_table, &sess2_tup6, sess2) == 0);
+    session_table_add(sess_table, sess2);
     EXPECT_TRUE(session_table_find_lru(sess_table) == sess1);
 
     sess3 = session_pool_pop(sess_pool);
     EXPECT_TRUE(sess3 != NULL);
     session_set_id(sess3, 3);
     session_set_tuple(sess3, &sess3_tup6);
-    EXPECT_TRUE(session_table_add(sess_table, &sess3_tup6, sess3) == 0);
+    session_table_add(sess_table, sess3);
     EXPECT_TRUE(session_table_find_lru(sess_table) == sess1);
 
     // Delete Session
 
-    session_table_del(sess_table, &sess1_tup6);
+    session_table_del(sess_table, sess1);
     EXPECT_TRUE(session_table_find_lru(sess_table) == sess2);
 
-    session_table_del(sess_table, &sess2_tup6);
+    session_table_del(sess_table, sess2);
     EXPECT_TRUE(session_table_find_lru(sess_table) == sess3);
 
-    session_table_del(sess_table, &sess3_tup6);
+    session_table_del(sess_table, sess3);
     EXPECT_TRUE(session_table_find_lru(sess_table) == NULL);
 
     // Destroy