公众号授权40029错误

请求官方这个url请求授权https://open.weixin.qq.com/connect/oauth2/authorize?appid=wxfd965e088d2fdb94&redirect_uri=http%3A%2F%2Fyuepark.yueparking.cn%2FPaymentLogin%3Fstateid%3D1%26parkcode%3D000003%26strategyid%3D13%26starttime%3Dnull%26endtime%3Dnull%26CouponQRCode%3D12018112015534323616&response_type=code&scope=snsapi_userinfo&state=1&connect_redirect=1#wechat_redirect

错误码 errcode:40029 errmsg:invalid code, hints: [ req_id: ChBaM.5ce-3RLjda ]，为什么有些手机会出现code为null，这样获取不了openID了。