Game crashes/hangs when moving the king behind the horizon

[ByteCommander]

I managed to reproduce this twice already at the beginning of the first level that contains bishops.
At this sections very beginning, there is a nice free area to quickly walk straight to gain some space and time for the coming obstacles.

So I repeatedly hit the ↑ button until I run in a check. But when this happens and I'm far enough away from the camera to be completely covered in the shadow behind the horizon, the game stops. The chessboard road just does not move on and I can't react any more. Had to refresh the page to restart a new game.

[Unihedro]

Reproduced.

[m0nstering]

not playable on both desktop and mobile device. game hangs up just before the first move of black king

[xehpuk]

Uncaught TypeError: Cannot read property 'style' of null
    at t (game.js:formatted:784)
    at j (game.js:formatted:501)

Line: Fa.threateningPiece.shape.style.filter = "url(#" + Za + ")"

ChessPursuit/src/game.js

Line 1371 in 58ca8fc

player.threateningPiece.shape.style.filter = 'url(#'+ENEMY_FILTER+')';