Traceback (most recent call last):
  File "./The_Stolen_Crown.py", line 14, in <module>
    main()
  File "/home/balmung/source/git/The-Stolen-Crown-RPG/data/main.py", line 58, in main
    run_it.main()
  File "/home/balmung/source/git/The-Stolen-Crown-RPG/data/tools.py", line 85, in main
    self.update()
  File "/home/balmung/source/git/The-Stolen-Crown-RPG/data/tools.py", line 38, in update
    self.state.update(self.screen, self.keys, self.current_time)
  File "/home/balmung/source/git/The-Stolen-Crown-RPG/data/states/shop.py", line 131, in update
    state_function(surface, keys, current_time)
  File "/home/balmung/source/git/The-Stolen-Crown-RPG/data/states/shop.py", line 137, in normal_update
    self.gui.update(keys, current_time)
  File "/home/balmung/source/git/The-Stolen-Crown-RPG/data/shopgui.py", line 628, in update
    state_function(keys, current_time)
  File "/home/balmung/source/git/The-Stolen-Crown-RPG/data/shopgui.py", line 500, in buy_sell
    if self.check_for_sellable_items():
  File "/home/balmung/source/git/The-Stolen-Crown-RPG/data/shopgui.py", line 521, in check_for_sellable_items
    if item in self.sellable_items:
TypeError: argument of type 'NoneType' is not iterable

Traceback (most recent call last):
  File "The_Stolen_Crown.py", line 14, in <module>
    main()
  File "data\main.pyc", line 58, in main
  File "data\tools.pyc", line 85, in main
  File "data\tools.pyc", line 38, in update
  File "data\states\shop.pyc", line 131, in update
  File "data\states\shop.pyc", line 137, in normal_update
  File "data\shopgui.pyc", line 628, in update
  File "data\shopgui.pyc", line 542, in sell_items
IndexError: list index out of range