On duplicate save button product give this following fatal error, what are the issue in database or in some file, I recently migrate m2.2 to M2.3
Fatal error: Uncaught Error: Call to a member function getEntityId() on null in /var/www/html/live/vendor/magento/module-catalog-url-rewrite/Model/ProductUrlRewriteGenerator.php:187 Stack trace: #0 /var/www/html/live/vendor/magento/module-catalog-url-rewrite/Model/ProductUrlRewriteGenerator.php(141): MagentoCatalogUrlRewriteModelProductUrlRewriteGenerator->generateForGlobalScope(Object(MagentoCatalogModelResourceModelCategoryCollection), Object(MagentoCatalogModelProductInterceptor), NULL) #1 /var/www/html/live/vendor/magento/module-catalog-url-rewrite/Observer/ProductProcessUrlRewriteSavingObserver.php(71): MagentoCatalogUrlRewriteModelProductUrlRewriteGenerator->generate(Object(MagentoCatalogModelProductInterceptor)) #2 /var/www/html/live/vendor/magento/framework/Event/Invoker/InvokerDefault.php(88): MagentoCatalogUrlRewriteObserverProductProcessUrlRewriteSavingObserver->execute(Object(MagentoFrameworkEventObserver)) #3 /var/www/html/live/vendor/magento/framework/Event/Invoker/InvokerDefault.php in /var/www/html/live/vendor/magento/module-catalog-url-rewrite/Model/ProductUrlRewriteGenerator.php on line 187