Call to a member function dispatch() on null Magento\Framework\Model\AbstractModel.php on line 562

Question

Why do i get this dispatch() on null error from my custom module

My error stack trace says:

Vendor\Module\Observer\SyncObserver->execute( ) ..\InvokerDefault.php:73

Vendor\Module\Model\Engine->productUpdate( ) ..\SyncObserver.php:35

Vendor\Module\Observer\SyncObserver.php

 <?php
namespace Vendor\Module\Observer;

use \Magento\Framework\Event\Observer;
use Magento\Framework\Event\ObserverInterface;

class SyncObserver implements ObserverInterface
{
   protected $syncEngineFactory;

   protected $logger;

 function __construct
(
    \Vendor\Module\Model\Engine $syncEngineFactory      
)
{   
    $this->syncEngineFactory = $syncEngineFactory;
}

 public function execute(\Magento\Framework\Event\Observer $observer)
{
    $event = $observer->getEvent();
    $this->syncEngineFactory->saleOrderComplete($observer);
    $this->syncEngineFactory->productUpdate($observer);
    $this->syncEngineFactory->productDelete($observer);
}

etc/events.xml

  <event name="catalog_product_save_after">
    <observer name="catalog_product_save_after_handler" instance="Vendor\Module\Observer\SyncObserver"/>
</event>

Answer 1

Basically, you are wrong when getting the object from the event. In your case, we need to get the product object from the event: $product = $observer->getProduct().