diff --git a/docs/changes.md b/docs/changes.md
index 797d71eba..2571f00a7 100644
--- a/docs/changes.md
+++ b/docs/changes.md
@@ -1,5 +1,8 @@
 # 最新动态
 
+2022/11/21
+  * 完善widget_lookup接口，避免访问空指针导致程序崩溃(感谢雨欣提供补丁)
+
 2022/11/20
   * 增加lcd_mem的测试用例题(感谢智明提供补丁)
 
diff --git a/src/base/widget.c b/src/base/widget.c
index e7ea52f5c..d406595fd 100644
--- a/src/base/widget.c
+++ b/src/base/widget.c
@@ -1184,7 +1184,7 @@ static widget_t* widget_lookup_child(widget_t* widget, const char* name) {
   return_value_if_fail(widget != NULL && name != NULL, NULL);
 
   WIDGET_FOR_EACH_CHILD_BEGIN(widget, iter, i)
-  if (iter->name != NULL && tk_str_eq(iter->name, name)) {
+  if (iter != NULL && iter->name != NULL && tk_str_eq(iter->name, name)) {
     return iter;
   }
   WIDGET_FOR_EACH_CHILD_END()
@@ -1219,7 +1219,7 @@ static widget_t* widget_lookup_all(widget_t* widget, const char* name) {
   return_value_if_fail(widget != NULL && name != NULL, NULL);
 
   WIDGET_FOR_EACH_CHILD_BEGIN(widget, iter, i)
-  if (iter->name != NULL && tk_str_eq(iter->name, name)) {
+  if (iter != NULL && iter->name != NULL && tk_str_eq(iter->name, name)) {
     return iter;
   } else {
     iter = widget_lookup_all(iter, name);