I get an Unhandled Exception ("InvalidArgumentException") when opening the following URL in this Phabricator instance: https://secure.phabricator.com/T10034
Argument 1 passed to ManiphestTaskGraph::isParentTask() must be an instance of ManiphestTask, null given, called in /core/lib/phabricator/src/infrastructure/graph/ManiphestTaskGraph.php on line 79 and defined
It looks like this only happens when the user is not logged in. After I login it loads fine.
This is reproducible in Chrome and Firefox.