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(1/1) ContextErrorException

Notice: Undefined property: Product::$id_product

in phgoogletagmanager.php line 2581
at PhGoogleTagManager->compileProductData(object(Product))in phgoogletagmanager.php line 2614
at PhGoogleTagManager->generateEnhancedEcommercePageProduct()in phgoogletagmanager.php line 2449
at PhGoogleTagManager->generateEnhancedEcommerce('product')in phgoogletagmanager.php line 1785
at PhGoogleTagManager->hookDisplayHeader(array('cookie' => object(Cookie), 'cart' => object(Cart), 'altern' => 11))in Hook.php line 1007
at HookCore::coreCallHook(object(PhGoogleTagManager), 'hookDisplayHeader', array('cookie' => object(Cookie), 'cart' => object(Cart), 'altern' => 11))in Hook.php line 431
at HookCore::callHookOn(object(PhGoogleTagManager), 'displayHeader', array('cookie' => object(Cookie), 'cart' => object(Cart), 'altern' => 11))in Hook.php line 944
at HookCore::exec('displayHeader')in FrontController.php line 598
at FrontControllerCore->initContent()in ProductController.php line 417
at ProductControllerCore->initContent()in Controller.php line 306
at ControllerCore->run()in Dispatcher.php line 525
at DispatcherCore->dispatch()in index.php line 28