Issue: Problem Fixing Stale Custom Field Values in 4.1.3 Upgrade Script

ErrorException: Invalid argument supplied for foreach() src/addons/vw/vw/XF/Entity/EntityBase.php:358

#0 src/addons/vw/vw/XF/Entity/EntityBase.php(358): vw\vw\Setup\View->handle_php_error(2, 'Invalid argumen...', '...', 358, Array)
#1 src/addons/vw/vw/_core/controller/dm/xf2.php(138): vw\vw\XF\Entity\EntityBase->vwSetExisting('STRING')
#2 src/addons/vw/vw/_core/controller/dm/revision/vw.php(1096): vw_DM_Controller_XF2->set_existing('STRING')
#3 src/addons/vw/vw/_core/controller/dm/base/vw.php(785): vw_DM_Revision_Controller->set_existing_custom_field(Object(vw_DM_Controller_XF2), Array, Array, 1)
#4 src/addons/vw/vw/_core/controller/dm/revision/vw.php(999): vw_DM_Base_Controller->process_custom_fields()
#5 src/addons/vw/vw/_core/controller/dm/revision/vw.php(1644): vw_DM_Revision_Controller->process_custom_fields()
#6 src/addons/vw/vw/XF/Entity/EntityBase.php(513): vw_DM_Revision_Controller->pre_save(true)
#7 src/XF/Mvc/Entity/Entity.php(1355): vw\vw\XF\Entity\EntityBase->_preSave()
#8 src/addons/vw/vw/XF/Entity/EntityBase.php(504): XF\Mvc\Entity\Entity->preSave()
#9 src/addons/vw/vw/XF/Entity/EntityBase.php(571): vw\vw\XF\Entity\EntityBase->vwPreSave()
#10 src/addons/vw/vw/_core/controller/dm/xf2.php(401): vw\vw\XF\Entity\EntityBase->vwSave()
#11 src/addons/vw/vw/_install/lib/upgradepath/steps/4/1/3/base/vw.php(358): vw_DM_Controller_XF2->save()
#12 src/addons/vw/vw/Setup.php(333): vw_Install_UpgradePath_Steps_413_base_Controller->{closure}(Object(vw\vw\Setup\Caller\Upgrade), false)
#13 src/addons/vw/vw/Setup.php(1062): vw\vw\Setup->vwRunStep('upgrade', Object(vw_Install_UpgradePath_Steps_413_C_Controller_XF2), Array, 7)
#14 src/XF/Admin/Controller/AddOn.php(584): vw\vw\Setup->upgrade(Array)
#15 src/XF/Mvc/Dispatcher.php(350): XF\Admin\Controller\AddOn->actionUpgrade(Object(XF\Mvc\ParameterBag))
#16 src/XF/Mvc/Dispatcher.php(257): XF\Mvc\Dispatcher->dispatchClass('XF:AddOn', 'Upgrade', Object(XF\Mvc\RouteMatch), Object(XF\Admin\Controller\AddOn), NULL)
#17 src/XF/Mvc/Dispatcher.php(113): XF\Mvc\Dispatcher->dispatchFromMatch(Object(XF\Mvc\RouteMatch), Object(XF\Admin\Controller\AddOn), NULL)
#18 src/XF/Mvc/Dispatcher.php(55): XF\Mvc\Dispatcher->dispatchLoop(Object(XF\Mvc\RouteMatch))
#19 src/XF/App.php(2337): XF\Mvc\Dispatcher->run()
#20 src/XF.php(488): XF\App->run()
#21 admin.php(13): XF::runApp('XF\\Admin\\App')
#22 {main}

								if ($is_template)
								{
									$alt_values["$fieldid"] = $value['field_value'];
								}
								else
								{
									$old_values["$fieldid"] = $value['field_value'];
								}

								$prep = vw_DB::get()->query()->prepare(array(
									'r' => array(
										'table' => 'vw_revision',
										'alias' => 'r',
										'fields' => array(
											'pageid' => '',
											'revisionid' => '',
											'dateline' => ''
										)
									),
									'e' => array(
										'table' => 'vw_field_revision',
										'alias' => 'e',
										'fields' => array(
											'revisionid' => '',
											'fieldeditid' => '',
											'field_value_id' => ''
										)
									)
								));

								$subedit = vw_DB::get()->query()->select(array(
									'fields' => array(
										$prep['e']['fields']['revisionid'],
										$prep['e']['fields']['fieldeditid']
									),
									'table' => array('vw_field_revision' => 'e'),
									'joins' => array(
										array(
											'table' => array('vw_revision' => 'r'),
											'where' => vw_DB::get()->query()->eq($prep['r']['fields']['revisionid'], $prep['e']['fields']['revisionid'])
										)
									),
									'where' => array(
										vw_DB::get()->query()->eq($prep['e']['fields']['field_value_id'], $valueid),
										vw_DB::get()->query()->eq($prep['r']['fields']['pageid'], $page['pageid'])
									),
									'order' => array($prep['r']['fields']['dateline'] => 'DESC'),
									'first' => 1
								));

								if (!$subedit)
								{
									// last field edit is invalid
									continue;
								}

								$value += array(
									'fieldvalueid' => $valueid,
									'field_value_id' => $valueid,
									'fieldeditid' => $subedit['fieldeditid'],
									'fieldid' => $vfieldid,
									'template' => $is_template,
									'revisionid' => $subedit['revisionid'],
									'pageid' => $page['pageid']
								);

								if ($is_template)
								{
									$alt_values["$fieldid"] = $value;
								}
								else
								{
									$old_values["$fieldid"] = $value;
								}