Coupon code link problem (Patreon)

As you might notice that some Gumroad coupon links cannot be clicked. I've just known this too. For workaround, you could please copy the link manually and paste in a browser. I don't know why the problem still occurs even I copy the link to the  text directly. 

I must apologize for your inconvenience. If the workaround does not solve the problem, please send me a message here or through my Twitter WH6K so I can fix it.