[Konstantinos]

I'd like to point out that the index starts from 0 so it would be: d2[0][0], d2[0][1], d2[0][2]
Index 3 is out of bounds.

You can use another array with the size of d2 so you can know which position is taken and move on:

pawn Код:

new bool: d2_available[sizeof (d2)];

pawn Код:

for (new j; j != sizeof (d2_available); ++j)
{
    if (d2_available[j]) continue;
    
    d2_available[j] = true;
    SetPlayerPos(playerid, d2[j][0],d2[j][1],d2[j][2]);
    break;
}