diff --git a/source/libs/monitorfw/inc/taos_assert.h b/source/libs/monitorfw/inc/taos_assert.h
index 9fe05e910c..6c2583f3dc 100644
--- a/source/libs/monitorfw/inc/taos_assert.h
+++ b/source/libs/monitorfw/inc/taos_assert.h
@@ -23,9 +23,9 @@
 #define TAOS_ASSERT(i) assert(i);
 #else
 #define TAOS_ASSERT(i) \
-  if (i) return 1;
+  if (!(i)) return 1;
 #define TAOS_ASSERT_NULL(i) \
-  if (i) return NULL;
+  if (!(i)) return NULL;
 #endif  // TAOS_TEST
 
 #endif  // TAOS_ASSERT_H
diff --git a/source/libs/monitorfw/src/taos_linked_list.c b/source/libs/monitorfw/src/taos_linked_list.c
index 01716a18be..625d5b0eab 100644
--- a/source/libs/monitorfw/src/taos_linked_list.c
+++ b/source/libs/monitorfw/src/taos_linked_list.c
@@ -35,7 +35,6 @@ taos_linked_list_t *taos_linked_list_new(void) {
 
 int taos_linked_list_purge(taos_linked_list_t *self) {
   TAOS_ASSERT(self != NULL);
-  if (self == NULL) return 1;
   taos_linked_list_node_t *node = self->head;
   while (node != NULL) {
     taos_linked_list_node_t *next = node->next;
@@ -88,7 +87,6 @@ void *taos_linked_list_last(taos_linked_list_t *self) {
 
 int taos_linked_list_append(taos_linked_list_t *self, void *item) {
   TAOS_ASSERT(self != NULL);
-  if (self == NULL) return 1;
   taos_linked_list_node_t *node = (taos_linked_list_node_t *)taos_malloc(sizeof(taos_linked_list_node_t));
 
   node->item = item;
@@ -105,7 +103,6 @@ int taos_linked_list_append(taos_linked_list_t *self, void *item) {
 
 int taos_linked_list_push(taos_linked_list_t *self, void *item) {
   TAOS_ASSERT(self != NULL);
-  if (self == NULL) return 1;
   taos_linked_list_node_t *node = (taos_linked_list_node_t *)taos_malloc(sizeof(taos_linked_list_node_t));
 
   node->item = item;
@@ -147,7 +144,6 @@ void *taos_linked_list_pop(taos_linked_list_t *self) {
 
 int taos_linked_list_remove(taos_linked_list_t *self, void *item) {
   TAOS_ASSERT(self != NULL);
-  if (self == NULL) return 1;
   taos_linked_list_node_t *node;
   taos_linked_list_node_t *prev_node = NULL;
 #ifdef TAOS_LOG_ENABLE
@@ -226,7 +222,6 @@ int taos_linked_list_remove(taos_linked_list_t *self, void *item) {
 
 taos_linked_list_compare_t taos_linked_list_compare(taos_linked_list_t *self, void *item_a, void *item_b) {
   TAOS_ASSERT(self != NULL);
-  if (self == NULL) return 1;
   if (self->compare_fn) {
     return (*self->compare_fn)(item_a, item_b);
   } else {
@@ -241,14 +236,12 @@ size_t taos_linked_list_size(taos_linked_list_t *self) {
 
 int taos_linked_list_set_free_fn(taos_linked_list_t *self, taos_linked_list_free_item_fn free_fn) {
   TAOS_ASSERT(self != NULL);
-  if (self == NULL) return 1;
   self->free_fn = free_fn;
   return 0;
 }
 
 int taos_linked_list_set_compare_fn(taos_linked_list_t *self, taos_linked_list_compare_item_fn compare_fn) {
   TAOS_ASSERT(self != NULL);
-  if (self == NULL) return 1;
   self->compare_fn = compare_fn;
   return 0;
 }