Fatal error: Uncaught Error: Call to a member function getProductCollection() on null in /home/olystudio/public_html/app/code/Plumtree/Extendfiles/Model/Rewrite/Catalog/Product.php:38 Stack trace: #0 /home/olystudio/public_html/var/generation/Plumtree/Extendfiles/Model/Rewrite/Catalog/Product/Interceptor.php(24): Plumtree\Extendfiles\Model\Rewrite\Catalog\Product->getRelatedProductCollection() #1 /home/olystudio/public_html/app/code/Plumtree/Extendfiles/Block/Product/ProductList/Related.php(17): Plumtree\Extendfiles\Model\Rewrite\Catalog\Product\Interceptor->getRelatedProductCollection() #2 /home/olystudio/public_html/vendor/magento/module-catalog/Block/Product/ProductList/Related.php(109): Plumtree\Extendfiles\Block\Product\ProductList\Related->_prepareData() #3 /home/olystudio/public_html/vendor/magento/framework/View/Element/AbstractBlock.php(658): Magento\Catalog\Block\Product\ProductList\Related->_beforeToHtml() #4 /home/olystudio/public_html/vendor/magento/framework/Interception/Interceptor.php(146): Magento\Framewo in /home/olystudio/public_html/app/code/Plumtree/Extendfiles/Model/Rewrite/Catalog/Product.php on line 38