Removed setCollectShippingRates() on ShippingAddress because that method does not exist for a billing address. Also removed getBillingAddress() call because the empty address is already created 3 lines above.

Author: peterjaap

app/code/Magento/Quote/Model/QuoteManagement.php

@@ -232,7 +232,6 @@ public function createEmptyCart()
         $quote->setShippingAddress($this->quoteAddressFactory->create());
 
         try {
-            $quote->getBillingAddress()->setCollectShippingRates(true);
             $quote->getShippingAddress()->setCollectShippingRates(true);
 
             $this->quoteRepository->save($quote);