Internal Server Error when purchasing a Newspaper

[KadTheHunter]

Issue description

When you attempt to Buy a newspaper (wether one you published, or one someone else published), you crash.

• Expected result: To receive a newspaper
• Actual result: An Internal Server Error

Steps to reproduce the issue

1. Publish a newspaper
2. Attempt to buy it OR have someone else who has published a newspaper attempt to buy it
3. Upon further testing, if you Subscribe, you can get the newspaper fine, but if you try and Buy just a single copy, it crashes you.

   OS and versions