What gameplay feature is this bug affecting?
October Manticora Shop

What's the issue? Please include any error messages you receive and as much detail as possible.
Clicking 'Purchase' in either the box to buy Nepheline Feathers or Demonic Scales for Blood Beetles, without entering an amount you want to purchase, it reloads a blank page rather than reloading and displaying an error message.

Any links relating to this bug? For example, if a particular lion is bugging, what is the link to that lion?
https://www.lioden.com/manticora.php

Any screenshots you can provide us with?
https://i.gyazo.com/a91defb81838e2fd4153edbef732713b.png

Please provide us with step by step explanation how this bug happened so we can attempt to replicate it. If it's complex, please include screenshots where possible:
In either the Nepheline Feather or Demonic Scale box at the bottom of the page, click the Purchase button, leaving the Amount box blank

Page reloads empty