Fatal error: Uncaught Error: Call to undefined method Magento\Catalog\Model\Product\Type\Simple::getUsedProducts() in /home/storm/sites/fischbacher-com/app/code/Telescopic/Fischbacher/Observer/Predispatch.php:40 Stack trace: #0 /home/storm/sites/fischbacher-com/vendor/magento/framework/Event/Invoker/InvokerDefault.php(72): Telescopic\Fischbacher\Observer\Predispatch->execute(Object(Magento\Framework\Event\Observer)) #1 /home/storm/sites/fischbacher-com/vendor/magento/framework/Event/Invoker/InvokerDefault.php(60): Magento\Framework\Event\Invoker\InvokerDefault->_callObserverMethod(Object(Telescopic\Fischbacher\Observer\Predispatch), Object(Magento\Framework\Event\Observer)) #2 /home/storm/sites/fischbacher-com/vendor/magento/framework/Event/Manager.php(66): Magento\Framework\Event\Invoker\InvokerDefault->dispatch(Array, Object(Magento\Framework\Event\Observer)) #3 /home/storm/sites/fischbacher-com/generated/code/Magento/Framework/Event/Manager/Proxy.php(95): Magento\Framework\Event\Manager->dispatch('controller_acti...', in /home/storm/sites/fischbacher-com/app/code/Telescopic/Fischbacher/Observer/Predispatch.php on line 40