R1:4c1140a3a789

unbreak exception handling

Summary: fix T10306

Test Plan: ¯\_(ツ)_/¯

Reviewers: chad, #blessed_reviewers, epriestley

Reviewed By: #blessed_reviewers, epriestley

Subscribers: Korvin

Maniphest Tasks: T10306

Differential Revision: https://secure.phabricator.com/D15229