R1:a428bb8ad4ec

Conpherence - fix bug with possible null value

Summary: Fixes T7675. epriestley caught this in code review and I didn't implement it all the way

Test Plan: logicypoo

Reviewers: epriestley

Subscribers: Korvin, epriestley

Maniphest Tasks: T7675

Differential Revision: https://secure.phabricator.com/D12181