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Using a custom template in the React Grid will cause an NotFoundError in IE 11 when the component is unmounted.
I put up an example repo. Its using Create React App and all the relevant code is in the App.js file https://github.com/BjornFridal/syncfusion-grid-notfounderror-ie11
I am attaching a screendump of when the error is thrown.
Regards,
Bjørn