TinyAllen commented on issue #3276: Skywalking UI blank
URL: https://github.com/apache/skywalking/issues/3276#issuecomment-525221634
![image](https://user-images.githubusercontent.com/19775780/63757471-aeae3400-c8ec-11e9-8228-8341299cd897.png)
![image](https://user-images.githubusercontent.com/19775780/63757439-a2c27200-c8ec-11e9-8a96-458ca93f979d.png)
The root span can't has refs ,so it is a broken trace
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