Fix illegal access error
Fix illegal access error

Reviewed By: justinjhendrick

Differential Revision: D18493247

fbshipit-source-id: da543c29ec1ecca01c9427dda10e044b6e8d7158

facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex,facebook/redex