I created a product custom attribute $eavSetup->addAttribute( Product::ENTITY, ‘is_subscription_product’, [ ‘is_visible_in_grid’ => true, ‘is_html_allowed_on_front’ => false, ‘visible_on_front’ => false, ‘visible’ => true, ‘global’ => MagentoEavModelEntityAttributeScopedAttributeInterface::SCOPE_STORE, ‘label’ => __(‘Subscription’), ‘source’ => MagentoCatalogModelProductAttributeSourceBoolean::class, ‘backend’ => MagentoCatalogModelProductAttributeBackendBoolean::class, ‘type’ => ‘int’, ‘is_used_in_grid’ => true,… Read More »Undefined index on product listing modifier