React中的属性“ displayName”是什么？未捕获的TypeError：无法读取null的属性“ displayName”

Question

我收到以下错误，并且错误日志中没有任何内容可以帮助我定位或检测错误的出处。

Uncaught TypeError: Cannot read property 'displayName' of null
    at getDisplayName (VM12922 backend.js:9159)
    at getDataFiber (VM12922 backend.js:9888)
    at enqueueMount (VM12922 backend.js:10158)
    at mountFiber (VM12922 backend.js:10246)
    at VM12922 backend.js:10306
    at Set.forEach (<anonymous>)
    at Object.walkTree (VM12922 backend.js:10304)
    at VM12922 backend.js:8534
    at <anonymous>:52:32
    at Array.map (<anonymous>)
    at Object.emit (<anonymous>:51:66)
    at setupBackend (VM12922 backend.js:8621)
    at module.exports (VM12922 backend.js:8567)
    at Agent.<anonymous> (VM12922 backend.js:116)
    at Agent.g (VM12922 backend.js:981)
    at Agent.EventEmitter.emit (VM12922 backend.js:894)
    at VM12922 backend.js:302
    at VM12922 backend.js:7619
    at Array.forEach (<anonymous>)
    at VM12922 backend.js:7618
    at Array.forEach (<anonymous>)
    at Bridge._handleMessage (VM12922 backend.js:7611)
    at listener (VM12922 backend.js:92)

由于该错误，React devtools不会加载以查明该错误。

这是什么，我从哪里开始。我只有两个主要组件，即代码编译和渲染。 “ displayName”指的是什么？