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I get this error when i click on select dropdown field while trying to edit. It says : findDOMNode is deprecated in StrictMode. findDOMNode was passed an instance of Transition which is inside StrictMode. Instead, add a ref directly to the element you want to reference.

enter image description here

Here is the link to the codesandbox,

https://codesandbox.io/s/react-material-ui-0yqeo?file=/src/components/exercises/Form.js

Zach
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Nag
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  • [Issue is known and getting addressed in Material-UI Version 5 release.](https://github.com/mui-org/material-ui/blob/183f267fa5995ea2c6c2abd4517164204e74382e/docs/src/pages/guides/migration-v4/migration-v4.md#non-ref-forwarding-class-components) – Zach Aug 14 '20 at 19:25

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