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Summary: Pull Request resolved: https://github.com/facebook/react-native/pull/41451 After [this change in React](https://github.com/facebook/react/pull/27687), `ReactFabric.getPublicInstanceFromInternalInstanceHandle` can return `null` if the instance handle is a fiber that was unmounted (before that PR, it would throw an error). This modifies the DOM traversal API to gracefully handle that case. Changelog: [internal] Reviewed By: rshest Differential Revision: D51210455 fbshipit-source-id: 05de682d840eed7f22473800efe5fb910c8f3a0d