I'm not really sure if this is a bug.
You can spawn endless much monsters.
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else if (selection == 1) {
if (cm.getPlayer().getMap().getMonsterCount() == 0) {
cm.summonMob(blabla);
cm.dispose();
} else {
cm.sendOk("You can't spawn monsters if there are already monsters on the map");
cm.dispose();
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Hope this helps you guys.
~NmZero