diff --git a/app/api/server/UserServer.php b/app/api/server/UserServer.php
index f6d5f4ee..1de21a52 100755
--- a/app/api/server/UserServer.php
+++ b/app/api/server/UserServer.php
@@ -192,7 +192,7 @@ class UserServer
                 } else {
                     $avatar = 'uploads/user/avatar/' . md5($openid . $time) . '.jpeg';
                     $StorageDriver = new StorageDriver($config);
-                    if (!$StorageDriver->fetch($avatar_url, $avatar)) {
+                    if ($avatar_url && !$StorageDriver->fetch($avatar_url, $avatar)) {
                         throw new Exception( '头像保存失败:'. $StorageDriver->getError());
                     }
                 }