I just started working on this new React app.
It was using <Suspense /> element in the component but I removed it. Then application is crashed with above error.
Is there any easy fix without know too much about <Suspense /> ?

You have 2 options:
Without Using suspense, you can configure that i18n.js like this:
i18n .use(XHR) .use(LanguageDetector) .init({ react: { useSuspense: false // <---- this will do the magic } }); Using Suspense, for example:
<Suspense fallback={<div>Loading... </div>}> <App /> </Suspense> In order to fix this without putting Suspense back in, you would need to get rid of usages of React.lazy.
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