Purchasing cards gives an error message?

[smashduke]

Was in the shop to purchase a darkness pack at the Gold level ($100);
I purchased a pack and got the cards, but when I purchased a second pack, I got the following message:

TypeError: undefined is not an object (evaluating 'card.element'), http://etg.dek.im/etgify.js, 6422, 58

I didn't get any cards and it took my $100!  - yikes.

Leaving the shop and coming back does not reset whatever is going wrong. Logging out and logging back in does do the trick though (and then I can buy at least two packs before it flakes out).

update:
I tried to purchase different packs and it seems that it wasn't a problem - is one of the darkness cards throwing an error?

[dworthy]

It could be. It happened to me once. I am a  player after all.

Edit: It just happened to me while I was buying  bronze packs.

[serprex]

Hard refresh (Ctlr-F5)

What browser are you using? Issue is finding a proper way to get browsers using If-Modified for caches

[smashduke]

Hard refresh (Ctlr-F5)

What browser are you using? Issue is finding a proper way to get browsers using If-Modified for caches

I'm using Safari (version 7.1.6)...  I'll hard refresh though.