If I call a removepano action on the player then using a embedpano action (sometime not on the first call but after multiple remove/embed) I can raise an exception where js["WebGL"] is null and can't access to js["WebGL"].canvas.
Never seen before into 1.19 pre3.
Here : function ys(){return Dr[k]&&bi==t?_r[b][I]:_r[xn].canvas}