try
I edited the players to players[i]PHP Code:
level.alliesteam = [];
players = getentarray("player", "classname");
for(i = 0; i < players.size; i++)
if(isdefined(players[i].pers["team"]) && players[i].pers["team"] == "allies" && players[i].sessionstate == "playing")
level.alliesteam[level.alliesteam.size] = players[i];
random = level.alliesteam[randomint(level.alliesteam.size)];