出现该错误的原因是：页面的跳转控制不好，换句话就是说程序的逻辑控制不好，导致了程序顺序执行的时候多次跳转到同一页面，有的程序员建议用多次使用return语句来返回，但是个人认为最好的还是自己要先理清页面跳转的逻辑。

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