IndexError

Level 1 of the Dungeon
(0, 0, D:1)
  a +0 mace
(1, 2, D:1)
  a +0 short sword
  5 stones
(2, 20, D:1)
  a +0 robe
(6, -7, D:1)
  2 stones
(7, 4, D:1)
  a +0 dagger
(8, 6, D:1)
  a ball python skeleton
(9, 20, D:1)
  a +0 dagger
(11, 0, D:1)
  a +0 dagger
  a goblin skeleton
(18, -4, D:1)
  a +0 club
(20, 4, D:1)
  a rat skeleton
(22, -9, D:1)
  a bat corpse
(24, 18, D:1)
  a rat skeleton
(26, 12, D:1)
  a +0 sling {Balvinder}
(30, 10, D:1)
  a +0 dagger
  5 stones
  a kobold skeleton
(31, 10, D:1)
  a rat skeleton
(33, 24, D:1)
  7 stones
(39, 22, D:1)
  4 boomerangs
(41, 22, D:1)
  a +0 spear
(42, 10, D:1)
  a stone
(50, 5, D:1)
  a +0 ring mail
(53, 16, D:1)
  a +0 trident