Virtual field being called on save

log.php

App\Model\Entity\Product::_getStockApiUniqueCode() - APP/Model/Entity/Product.php, line 109
Cake\ORM\Entity::get() - CORE/src/Datasource/EntityTrait.php, line 294
Cake\ORM\Entity::has() - CORE/src/Datasource/EntityTrait.php, line 340
Cake\ORM\Entity::offsetExists() - CORE/src/Datasource/EntityTrait.php, line 473
App\Model\Table\ProductsTable::beforeSave() - APP/Model/Table/ProductsTable.php, line 138
Cake\Event\EventManager::_callListener() - CORE/src/Event/EventManager.php, line 390
Cake\Event\EventManager::dispatch() - CORE/src/Event/EventManager.php, line 356
Cake\ORM\Table::dispatchEvent() - CORE/src/Event/EventDispatcherTrait.php, line 78
Cake\ORM\Table::_processSave() - CORE/src/ORM/Table.php, line 1439
Cake\ORM\Table::Cake\ORM\{closure}() - CORE/src/ORM/Table.php, line 1391
Cake\Database\Connection::transactional() - CORE/src/Database/Connection.php, line 557
Cake\ORM\Table::save() - CORE/src/ORM/Table.php, line 1392
Cake\ORM\Association\HasMany::saveAssociated() - CORE/src/ORM/Association/HasMany.php, line 175
Cake\ORM\AssociationCollection::_save() - CORE/src/ORM/AssociationCollection.php, line 251
Cake\ORM\AssociationCollection::_saveAssociations() - CORE/src/ORM/AssociationCollection.php, line 227
Cake\ORM\AssociationCollection::saveChildren() - CORE/src/ORM/AssociationCollection.php, line 192
Cake\ORM\Table::_processSave() - CORE/src/ORM/Table.php, line 1471
Cake\ORM\Table::Cake\ORM\{closure}() - CORE/src/ORM/Table.php, line 1391
Cake\Database\Connection::transactional() - CORE/src/Database/Connection.php, line 557
Cake\ORM\Table::save() - CORE/src/ORM/Table.php, line 1392