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Cannot read property includes of undefined [closed]

I have to filter an array, it doesn't work for my project. This is the code: edit: This is the whole code: http://collabedit.com/2prqs

$("#searchBar").on("keyup", function(e){

    const searchString = e.target.value;
    console.log(searchString)
    let filteredCoins = coinsArray.filter((coin) => {
        return coin.symbol.includes(searchString);     
        });
        console.log(filteredCoins)
})

and this is the error I'm getting:

Uncaught TypeError: Cannot read property 'includes' of undefined

Does anyone know why?

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