Malformed UTF-8 data
已上线的小程序，今天接到报告说有问题，然后在公众平台的『运维中心』看到如下这些日志：
| 2018-03-28 | 6.6.5 | 10 | 4 | 4 | 100.00% | Malformed UTF-8 data;at pages/logo/logo onReady function;at api operateWXData success callback function |
| 2018-03-28 | 6.6.5 | 10 | 3 | 3 | 100.00% | Malformed UTF-8 data;at pages/logo/logo onShow function;at api operateWXData success callback function |
| 2018-03-28 | 6.6.5 | 10 | 10 | 10 | 100.00% | Malformed UTF-8 data;at pages/logo/logo page lifeCycleMethod onShow function |
| 2018-03-29 | 6.6.5 | 10 | 5 | 5 | 100.00% | Malformed UTF-8 data;at pages/logo/logo onReady function;at api operateWXData success callback function |
| 2018-03-29 | 6.6.5 | 10 | 7 | 7 | 100.00% | Malformed UTF-8 data;at pages/logo/logo onShow function;at api operateWXData success callback function |
| 2018-03-29 | 6.6.5 | 10 | 13 | 13 | 100.00% | Malformed UTF-8 data;at pages/logo/logo page lifeCycleMethod onShow function |
| 2018-03-30 | 6.5.7 | 10 | 1 | 1 | 100.00% | undefined is not a function (near '...wx.getSetting...');at "pages/logo/logo" page lifeCycleMethod onShow function |
| 2018-03-30 | 6.6.3 | 10 | 1 | 3 | 33.33% | Malformed UTF-8 data;at pages/logo/logo onShow function;at api operateWXData success callback function |
| 2018-03-30 | 6.6.3 | 10 | 2 | 17 | 11.76% | Malformed UTF-8 data;at pages/logo/logo page lifeCycleMethod onShow function |
使用IDE没发现问题，真机预览也没发现问题，从错误信息看不出来是哪里出了问题，请问怎么排查这个异常？
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