In the last few Magento releases (I have personally faced the issue in versions 220.127.116.11 and 18.104.22.168) when trying to create a new product in the back end Magento returns an error and products are not created.
The error message is
Fatal error: Call to a member function deletePriceData() on a non-object in \app\code\core\Mage\Catalog\Model\Product\Attribute\Backend\Tierprice.php on line 238
This error is given because in these Magento releases one file is missing. Actually it is present but the extension is .ph in place of .php
The file is located at
In this folder rename Tierprice.ph to Tierprice.php
Its funny how this error persisted across versions but with the above solution you can forget about that 🙂