Bug, King promotion not possible at Antichess analysis mode

I noticed that I can not promote pawn to a King when I was analysing my Antichess game.

Great catch, can you link to the game as well?

This is reproducible from:
http://en.lichess.org/MQE8QOVf

with the moves:
1 e3 b5
2 Bxb5 f6
3 Bxd7 Kxd7
4 Qg4 Ke6
5 Qxe6 Qxd2
6 Nxd2 Bxe6
7 c4 Bxc4
8 Nxc4 a5
9 Nxa5 Rxa5
10 Rb1 Rxa2
11 b3 Rxf2
12 Kxf2 g5
13 Nf3 f5
14 Nxg5 f4
15 Nxh7 Rxh7
16 exf4 Rxh2
17 Rxh2 e5
18 fxe5 Bd6
19 exd6 cxd6
20 Rh6 Nxh6
21 Bxh6 Nd7
22 g4d 5
23 Kg3 d4
24 Bg7 d3
25 Bh8 d2
26 Rb2 d1=K

Here is example position:

http://fi.lichess.org/v4khN8LV#62