Fix getActiveNotifications crash
Fix getActiveNotifications crash

Reviewed By: danielbuechele

Differential Revision: D15822750

fbshipit-source-id: 1f8f41437db842197e6ab74e0559a710f80ff786

facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper