Traceback (most recent call last):
  File "/usr/share/games/monsterz/monsterz.py", line 1998, in <module>
    main()
  File "/usr/share/games/monsterz/monsterz.py", line 1993, in main
    monsterz.go()
  File "/usr/share/games/monsterz/monsterz.py", line 1271, in go
    iterator()
  File "/usr/share/games/monsterz/monsterz.py", line 1381, in iterate_menu
    self.copyright_draw()
  File "/usr/share/games/monsterz/monsterz.py", line 1300, in copyright_draw
    system.blit(scroll, (13, 437))
  File "/usr/share/games/monsterz/monsterz.py", line 403, in blit
    self.background.blit(surf, coords)
error: Surfaces must not be locked during blit