I just did.
OK,
now it should be impossible no matter how much you try.
Thanks for your reply and for fixing the bug. Isn't a real destructive bug, but 301 non-intentional sent sMerits is something since merits are an unreversible action.
And want to thanks the community too, thanks guys for your help to solve this issue, not let's enjoy the last weekend of the year.

Since this is a bug, is this double click double merit thing only works if you have enough spendable merit? I mean If I have one spendable merit, then this won't work on me right?
No, with one merit shouldn't work.