jsx-key `Missing "key" prop for element in array` when there is no array/iteration · Issue #3215 · jsx-eslint/eslint-plugin-react · GitHub
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Cannot read property 'type' of null error in no-array-index-key.js · Issue #1242 · jsx-eslint/eslint-plugin-react · GitHub
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reactjs - cannot read properties of undefined // access specific index of array in react js [0] - Stack Overflow
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