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エラーコード追記

2019/07/18 01:43

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onakahetta
onakahetta

スコア23

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@@ -14,6 +14,16 @@
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  ```
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  Cannot read property 'toLowerCase' of undefined
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  TypeError: Cannot read property 'toLowerCase' of undefined
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+ at ReactDOMServerRenderer.renderDOM (/usr/src/app/node_modules/react-dom/cjs/react-dom-server.node.development.js:2776:28)
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+ at ReactDOMServerRenderer.render (/usr/src/app/node_modules/react-dom/cjs/react-dom-server.node.development.js:2755:23)
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+ at ReactDOMServerRenderer.read (/usr/src/app/node_modules/react-dom/cjs/react-dom-server.node.development.js:2722:19)
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+ at renderToString (/usr/src/app/node_modules/react-dom/cjs/react-dom-server.node.development.js:2980:25)
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+ at renderPage (/usr/src/app/node_modules/next/dist/server/render.js:174:26)
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+ at Function.getInitialProps (/usr/src/app/node_modules/next/dist/server/document.js:83:25)
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+ at Function._callee$ (/usr/src/app/pages/_document.js:6:25)
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+ at tryCatch (/usr/src/app/node_modules/babel-runtime/node_modules/regenerator-runtime/runtime.js:65:40)
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+ at Generator.invoke [as _invoke] (/usr/src/app/node_modules/babel-runtime/node_modules/regenerator-runtime/runtime.js:299:22)
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+ at Generator.prototype.(anonymous function) [as next] (/usr/src/app/node_modules/babel-runtime/node_modules/regenerator-runtime/runtime.js:117:21)
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  ```
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  refを使う方法も試してみたのですが、いまいち理解できずこちらもエラーが起きてしまいました。
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