MassiveCraft/Factions — comment on commit c19f3405bf1ba406b517f14da7c3236fb04834ba
File:  line 0
By iKeirNez:

@Brettflan To stop it damaging mobs and players add this after event.setCancelled()

exploitExplosion.setIsIncendiary(false);
exploitExplosion.setYield(0);

That should hopefully fix it.