Reconciliation of COU members groups causes ChangelogBehavior to throw RuntimeException

"Reconcile All Members Groups" threw this stack trace found in the logs of a deployment but it is not apparent what conditions led to it:

2016-04-20 12:09:07 Error: [RuntimeException] Record is already marked deleted
Request URL: /registry/co_groups/reconcile.json?coid=2
Stack Trace:
#0 [internal function]: ChangelogBehavior->beforeDelete(Object(CoGroup), true)
#1 /opt/comanage-registry-feature-co1204-fixes/lib/Cake/Utility/ObjectCollection.php(128): call_user_func_array(Array, Array)
#2 [internal function]: ObjectCollection->trigger(Object(CakeEvent))
#3 /opt/comanage-registry-feature-co1204-fixes/lib/Cake/Event/CakeEventManager.php(243): call_user_func(Array, Object(CakeEvent))
#4 /opt/comanage-registry-feature-co1204-fixes/lib/Cake/Model/Model.php(2685): CakeEventManager->dispatch(Object(CakeEvent))
#5 /opt/comanage-registry-feature-co1204-fixes/app/Model/AppModel.php(458): Model->delete('258', true)
#6 /opt/comanage-registry-feature-co1204-fixes/app/Model/CoGroup.php(586): AppModel->delete('258')
#7 /opt/comanage-registry-feature-co1204-fixes/app/Controller/CoGroupsController.php(535): CoGroup->reconcileMembersGroupsExistence('2')
#8 [internal function]: CoGroupsController->reconcile()
#9 /opt/comanage-registry-feature-co1204-fixes/lib/Cake/Controller/Controller.php(490): ReflectionMethod->invokeArgs(Object(CoGroupsController), Array)
#10 /opt/comanage-registry-feature-co1204-fixes/lib/Cake/Routing/Dispatcher.php(193): Controller->invokeAction(Object(CakeRequest))
#11 /opt/comanage-registry-feature-co1204-fixes/lib/Cake/Routing/Dispatcher.php(167): Dispatcher->_invoke(Object(CoGroupsController), Object(CakeRequest))
#12 /opt/comanage-registry-feature-co1204-fixes/app/webroot/index.php(96): Dispatcher->dispatch(Object(CakeRequest), Object(CakeResponse))
#13