似乎您在Magento安装中的某个地方定义了事件观察器(我想在第3个第三方模块之一中). 从我的角度来看，似乎为该事件注册了一个空方法.

Seems as if you have an event observer defined somewhere in your Magento installation (I suppose in one of the 3rd-party-modules). From my point of view it looks like there is an empty method registered for the event.

为正在监听事件"checkout_type_onepage_save_order"的观察者检查模块的config.xml(您可以轻松地为该字符串grep您的app/code/community和app/code/local文件夹).尝试禁用该模块(通过app/etc/modules/Module_Name.xml)，然后尝试再次签出.

Check the config.xml's of your modules for an observer that is listening on the event 'checkout_type_onepage_save_order' (you can easily grep your app/code/community and app/code/local folder for this string). Try disabling the module (via app/etc/modules/Module_Name.xml) and then try to checkout again.