Voucher AJAX bug (Privátny)

Jak vyvolat chybu: Open https://www.itnetwork.cz/dobiti-bodu and enter a voucher code in the form, not an offer code, don't submit the form

Chybné chování: A red AJAX message tells you the code is expired or invalid and bans you (I tried it like 1-2 times, why I got banned?)

Předpokládané chování: A green AJAX message tells that the points were added successfully (it works in this form - https://www.itnetwork.cz/darkovy-kupon). Also tests would ensure this works.