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Summary: This fixes a regression introduced in https://github.com/facebook/react-native/commit/df70005c12e3be14bfbdf0b32f9ea0a5c052deba If you set navigationBar props (on Navigator) and then later set it back to null, it will crashes. (N.B. this should be possible as navigationBar is optional) cc satya164 Closes https://github.com/facebook/react-native/pull/4941 Reviewed By: svcscm Differential Revision: D2788889 Pulled By: bestander fb-gh-sync-id: f8f1cd6cc2ce13b1b1b86fa76d3b22c26a8adb5b