Recurring event logic bombs during setup of demo site [CiviVolunteer]

Currently, the sandbox site running Drupal & CiviCRM [master] fails to build:

https://test.civicrm.org/view/Sites/job/demo.civicrm.org/BLDNAME=dmaster,label=www-demo/35/console

The problem occurs during installation of CiviVolunteer. I obtained a backtrace and then added some debug code to CRM_Core_BAO_RecurringEntity::triggerInsert() (circa line 616 – var_dump($linkedDAO). The combined output with the debug code and backtrace is here:

------------------
totten@thneed:~/buildkit/build/dmaster$ civibuild restore dmaster ; drush -y cvapi extension.install key=org.civicrm.volunteer debug=1
[[Load saved options from /Users/totten/buildkit/build/dmaster.sh]]
[[Setup MySQL and HTTP for CMS]]
[[Restore "CMS" DB (dmastercms_vc6m1) from file (/Users/totten/buildkit/app/snapshot/dmaster/cms.sql.gz)]]
[[Setup MySQL for Civi]]
[[Restore "CIVI" DB (dmasterciv_ojunt) from file (/Users/totten/buildkit/app/snapshot/dmaster/civi.sql.gz)]]
[[Setup MySQL for Test]]
[[Restore "TEST" DB (dmastertes_iomjr) from file (/Users/totten/buildkit/app/snapshot/dmaster/civi.sql.gz)]]
array(1) {
["triggerInsert"]=>
array(1) {
["$linkedDAO"]=>
object(CRM_Core_DAO_UFJoin)#138 (20) {
["id"]=>
string(2) "12"
["is_active"]=>
string(1) "1"
["module"]=>
string(13) "CiviVolunteer"
["entity_table"]=>
NULL
["entity_id"]=>
NULL
["weight"]=>
string(2) "10"
["uf_group_id"]=>
string(2) "14"
["module_data"]=>
NULL
["_DB_DataObject_version"]=>
string(6) "1.8.12"
["__table"]=>
string(15) "civicrm_uf_join"
["N"]=>
int(1)
["_database_dsn"]=>
string(0) ""
["_database_dsn_md5"]=>
string(32) "3ec7ae8f080d4945955e5e8155244884"
["_database"]=>
string(16) "dmasterciv_ojunt"
["_query"]=>
array(7)

{ ["condition"]=> string(0) "" ["group_by"]=> string(0) "" ["order_by"]=> string(0) "" ["having"]=> string(0) "" ["limit_start"]=> string(0) "" ["limit_count"]=> string(0) "" ["data_select"]=> string(1) "*" }

["_DB_resultid"]=>
int(30)
["_resultFields"]=>
bool(false)
["_link_loaded"]=>
bool(false)
["_join"]=>
string(0) ""
["_lastError"]=>
bool(false)
}
}
}
Array
(
[trace] => #0 /Users/totten/buildkit/build/dmaster/sites/all/modules/civicrm/CRM/Utils/Type.php(347): CRM_Core_Error::fatal('One of paramete...')
#1 /Users/totten/buildkit/build/dmaster/sites/all/modules/civicrm/CRM/Core/DAO.php(1198): CRM_Utils_Type::validate(NULL, 'Integer')
#2 /Users/totten/buildkit/build/dmaster/sites/all/modules/civicrm/CRM/Core/DAO.php(1164): CRM_Core_DAO::composeQuery('? SELECT p...', Array, true)
#3 /Users/totten/buildkit/build/dmaster/sites/all/modules/civicrm/CRM/Core/BAO/RecurringEntity.php(451): CRM_Core_DAO::singleValueQuery('? SELECT p...', Array)
#4 /Users/totten/buildkit/build/dmaster/sites/all/modules/civicrm/CRM/Core/BAO/RecurringEntity.php(418): CRM_Core_BAO_RecurringEntity::getParentFor(NULL, NULL)
#5 /Users/totten/buildkit/build/dmaster/sites/all/modules/civicrm/CRM/Core/BAO/RecurringEntity.php(620): CRM_Core_BAO_RecurringEntity::getEntitiesFor(NULL, NULL)
#6 [internal function]: CRM_Core_BAO_RecurringEntity::triggerInsert(Object(Civi\Core\DAO\Event\PostUpdate))
#7 /Users/totten/buildkit/build/dmaster/sites/all/modules/civicrm/packages/vendor/symfony/event-dispatcher/Symfony/Component/EventDispatcher/EventDispatcher.php(164): call_user_func(Array, Object(Civi\Core\DAO\Event\PostUpdate))
#8 /Users/totten/buildkit/build/dmaster/sites/all/modules/civicrm/packages/vendor/symfony/event-dispatcher/Symfony/Component/EventDispatcher/EventDispatcher.php(53): Symfony\Component\EventDispatcher\EventDispatcher->doDispatch(Array, 'DAO::post-inser...', Object(Civi\Core\DAO\Event\PostUpdate))
#9 /Users/totten/buildkit/build/dmaster/sites/all/modules/civicrm/CRM/Core/DAO.php(461): Symfony\Component\EventDispatcher\EventDispatcher->dispatch('DAO::post-inser...', Object(Civi\Core\DAO\Event\PostUpdate))
#10 /Users/totten/buildkit/build/dmaster/sites/all/modules/civicrm/CRM/Utils/Migrate/Import.php(470): CRM_Core_DAO->save()
#11 /Users/totten/buildkit/build/dmaster/sites/all/modules/civicrm/CRM/Utils/Migrate/Import.php(86): CRM_Utils_Migrate_Import->profileJoins(Object(SimpleXMLElement), Array)
#12 /Users/totten/buildkit/build/dmaster/sites/all/modules/civicrm/CRM/Utils/Migrate/Import.php(57): CRM_Utils_Migrate_Import->runXmlElement(Object(SimpleXMLElement))
#13 /Users/totten/buildkit/build/dmaster/sites/all/modules/civicrm/tools/extensions/civivolunteer/CRM/Volunteer/Upgrader/Base.php(95): CRM_Utils_Migrate_Import->run('/Users/totten/b...')
#14 /Users/totten/buildkit/build/dmaster/sites/all/modules/civicrm/tools/extensions/civivolunteer/CRM/Volunteer/Upgrader/Base.php(245): CRM_Volunteer_Upgrader_Base::executeCustomDataFileByAbsPath('/Users/totten/b...')
#15 /Users/totten/buildkit/build/dmaster/sites/all/modules/civicrm/tools/extensions/civivolunteer/volunteer.civix.php(45): CRM_Volunteer_Upgrader_Base->onInstall()
#16 /Users/totten/buildkit/build/dmaster/sites/all/modules/civicrm/tools/extensions/civivolunteer/volunteer.php(99): _volunteer_civix_civicrm_install()
#17 /Users/totten/buildkit/build/dmaster/sites/all/modules/civicrm/CRM/Extension/Manager/Module.php(77): volunteer_civicrm_install()
#18 /Users/totten/buildkit/build/dmaster/sites/all/modules/civicrm/CRM/Extension/Manager/Module.php(50): CRM_Extension_Manager_Module->callHook(Object(CRM_Extension_Info), 'install')
#19 /Users/totten/buildkit/build/dmaster/sites/all/modules/civicrm/CRM/Extension/Manager.php(224): CRM_Extension_Manager_Module->onPreInstall(Object(CRM_Extension_Info))
#20 /Users/totten/buildkit/build/dmaster/sites/all/modules/civicrm/api/v3/Extension.php(63): CRM_Extension_Manager->install(Array)
#21 /Users/totten/buildkit/build/dmaster/sites/all/modules/civicrm/Civi/API/Provider/MagicFunctionProvider.php(86): civicrm_api3_extension_install(Array)
#22 /Users/totten/buildkit/build/dmaster/sites/all/modules/civicrm/Civi/API/Kernel.php(95): Civi\API\Provider\MagicFunctionProvider->invoke(Array)
#23 /Users/totten/buildkit/build/dmaster/sites/all/modules/civicrm/api/api.php(25): Civi\API\Kernel->run('extension', 'install', Array, NULL)
#24 /Users/totten/buildkit/build/dmaster/sites/all/modules/civicrm/drupal/drush/civicrm.drush.inc(1365): civicrm_api('extension', 'install', Array)
#25 [internal function]: drush_civicrm_api('extension.insta...', 'key=org.civicrm...', 'debug=1')
#26 /Users/totten/buildkit/vendor/drush/drush/includes/command.inc(362): call_user_func_array('drush_civicrm_a...', Array)
#27 /Users/totten/buildkit/vendor/drush/drush/includes/command.inc(214): _drush_invoke_hooks(Array, Array)
#28 [internal function]: drush_command('extension.insta...', 'key=org.civicrm...', 'debug=1')
#29 /Users/totten/buildkit/vendor/drush/drush/includes/command.inc(182): call_user_func_array('drush_command', Array)
#30 /Users/totten/buildkit/vendor/drush/drush/drush.php(92): drush_dispatch(Array)
#31 /Users/totten/buildkit/vendor/drush/drush/drush.php(61): _drush_bootstrap_and_dispatch()
#32 /Users/totten/buildkit/vendor/drush/drush/drush.php(16): drush_main()
#33

{main}

[is_error] => 1
[error_message] => A fatal error was triggered: One of parameters (value: ) is not of the type Integer
)
------------------

CiviVolunteer apparently creates a record in civicrm_uf_join during installation, and the triggerInsert() doesn't seem to understand this record (which has NULL values for entity-table/entity-id):

mysql> select * from civicrm_uf_join;
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I'm not familiar enough with what's going on here to determine the right fix. (Can it be as simple as ignoring records with null entity-ids?)