diff --git a/demo/demo_stack.c b/demo/demo_stack.c
index 68c8669..4cf2177 100644
--- a/demo/demo_stack.c
+++ b/demo/demo_stack.c
@@ -200,7 +200,6 @@ static void demo_stack_struct(void)
         }
     }
 
-    stack->_destory(stack);
     stack_free(&stack);
 }
 
diff --git a/src/stack.c b/src/stack.c
index f700da7..58af23a 100644
--- a/src/stack.c
+++ b/src/stack.c
@@ -124,7 +124,6 @@ static uint32_t stack_capacity(struct _stack* self)
 static bool stack_clear(struct _stack* self)
 {
     assert(self != NULL);
-    assert(self->_head != NULL);
     if (self->empty(self))
     {
         return true;