fix some issues.

src/main/java/cn/quantgroup/xyqb/event/WechatBindingEventListener.java

@@ -31,7 +31,7 @@ public class WechatBindingEventListener implements ApplicationListener<UserLogin
     public void onApplicationEvent(UserLoginEvent userLoginEvent) {
         if (userLoginEvent.getUserTag() != null) {
             User user = userRepository.findByIdAndTenantId(userLoginEvent.getUserTag().getUserId(), userLoginEvent.getUserTag().getTenantId());
-            if (StringUtils.isNotEmpty(user.getPhoneNo())) {
+            if (user != null && StringUtils.isNotEmpty(user.getPhoneNo())) {
                 List<WechatUserInfo> wechatUserInfoList = weChatUserRepository.findByPhoneNoAndTenantId(user.getPhoneNo(), user.getTenantId());
                 wechatUserInfoList.forEach(i -> i.setUserId(user.getId()));
                 weChatUserRepository.save(wechatUserInfoList);