EXCEPTION (RuntimeException): Undefined variable: old #0 /core/data/drydock/workingcopy-83/repo/phabricator/src/applications/transactions/storage/PhabricatorModularTransactionType.php(313): PhutilErrorHandler::handleError(8, 'Undefined varia...', '/core/data/dryd...', 313, Array) #1 /core/data/drydock/workingcopy-83/repo/phabricator/src/applications/conpherence/xaction/ConpherenceThreadParticipantsTransaction.php(87): PhabricatorModularTransactionType->getAddedPHIDList() #2 /core/data/drydock/workingcopy-83/repo/phabricator/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php(2094): ConpherenceThreadParticipantsTransaction->validateTransactions(Object(ConpherenceThread), Array) #3 /core/data/drydock/workingcopy-83/repo/phabricator/src/applications/transactions/editor/PhabricatorApplicationTransactionEditor.php(849): PhabricatorApplicationTransactionEditor->validateTransaction(Object(ConpherenceThread), 'participants', Array) #4 /core/data/drydock/workingcopy-83/repo/phabricator/src/applications/conpherence/__tests__/ConpherenceRoomTestCase.php(122): PhabricatorApplicationTransactionEditor->applyTransactions(Object(ConpherenceThread), Array) #5 /core/data/drydock/workingcopy-83/repo/phabricator/src/applications/conpherence/__tests__/ConpherenceRoomTestCase.php(15): ConpherenceRoomTestCase->createRoom(Object(PhabricatorUser), Array) #6 [internal function]: ConpherenceRoomTestCase->testOneUserRoomCreate() #7 /core/data/drydock/workingcopy-83/repo/arcanist/src/unit/engine/phutil/PhutilTestCase.php(492): call_user_func_array(Array, Array) #8 /core/data/drydock/workingcopy-83/repo/arcanist/src/unit/engine/PhutilUnitTestEngine.php(69): PhutilTestCase->run() #9 /core/data/drydock/workingcopy-83/repo/arcanist/src/unit/engine/ArcanistConfigurationDrivenUnitTestEngine.php(147): PhutilUnitTestEngine->run() #10 /core/data/drydock/workingcopy-83/repo/arcanist/src/workflow/ArcanistUnitWorkflow.php(167): ArcanistConfigurationDrivenUnitTestEngine->run() #11 /core/data/drydock/workingcopy-83/repo/arcanist/scripts/arcanist.php(394): ArcanistUnitWorkflow->run() #12 {main}