wesnoth crash

Battle for Wesnoth v1.6
Started on Tue Apr 14 18:31:38 2009

Game executable doesn't have the name "wesnoth" or similar; impossible to guess the server executable name.
20090414 18:31:38 info display: Initialized true type fonts
20090414 18:31:38 debug filesystem: directory /Users/roland/Library/Preferences/Wesnoth_1.6 exists, not creating
20090414 18:31:38 debug filesystem: directory /Users/roland/Library/Preferences/Wesnoth_1.6/editor exists, not creating
20090414 18:31:38 debug filesystem: directory /Users/roland/Library/Preferences/Wesnoth_1.6/editor/maps exists, not creating

*** HUUUUUGE SNIP ***

    20090414 18:34:28 } END: Canvas: drawing. (took 0ms)
    20090414 18:34:28 { BEGIN: Canvas: drawing.
      20090414 18:34:28 debug gui_draw: Canvas: nothing to draw.
    20090414 18:34:28 } END: Canvas: drawing. (took 0ms)
    20090414 18:34:28 { BEGIN: Canvas: drawing.
      20090414 18:34:28 debug gui_draw: Canvas: nothing to draw.
    20090414 18:34:28 } END: Canvas: drawing. (took 1ms)
    20090414 18:34:28 debug gui_event: Event: mouse enter.
    20090414 18:34:29 debug gui_event: Event: Left button down.
    20090414 18:34:29 debug gui_event: Event: Left button up.
  20090414 18:34:29 } END: Window: show. (took 1679ms)
20090414 18:34:29 debug display: invalidate_all()
20090414 18:34:29 debug display: draw() with invalidateAll
20090414 18:34:29 debug engine: done handling command...
20090414 18:34:29 } END: handle_event_command (took 1974ms)
20090414 18:34:29 { BEGIN: handle_event_command
20090414 18:34:29 info engine: handling command 'store_unit' from cfg 0x1847E9A0
20090414 18:34:29 debug config: trying to find Gryphon in unit_type list (unit_type_data.unit_types)
20090414 18:34:29 debug engine: Building unit type Gryphon, level 4
20090414 18:34:29 debug engine: Replace unit 234
20090414 18:34:29 debug engine: done handling command...
20090414 18:34:29 } END: handle_event_command (took 3ms)
20090414 18:34:29 { BEGIN: handle_event_command
20090414 18:34:29 info engine: handling command 'set_variable' from cfg 0x1847EAC0
20090414 18:34:29 debug engine: done handling command...
20090414 18:34:29 } END: handle_event_command (took 0ms)
20090414 18:34:29 { BEGIN: handle_event_command
20090414 18:34:29 info engine: handling command 'set_variable' from cfg 0x1847EB40
20090414 18:34:29 debug engine: done handling command...
20090414 18:34:29 } END: handle_event_command (took 0ms)
20090414 18:34:29 { BEGIN: handle_event_command
20090414 18:34:29 info engine: handling command 'move_unit_fake' from cfg 0x1847EC00
20090414 18:34:29 debug config: trying to find Gryphon in unit_type list (unit_type_data.unit_types)
20090414 18:34:29 debug engine: Building unit type Gryphon, level 4
20090414 18:34:29 info engine: Generating a trait for unit type Gryphon with musthaveonly 1
20090414 18:34:29 debug config: trying to find Gryphon in unit_type list (unit_type_data.unit_types)
20090414 18:34:29 debug engine: Building unit type Gryphon, level 4
  20090414 18:34:29 { BEGIN: apply mods
  20090414 18:34:29 } END: apply mods (took 0ms)
20090414 18:34:29 info engine: Generating a trait for unit type Gryphon with musthaveonly 1
20090414 18:34:29 debug config: trying to find Gryphon in unit_type list (unit_type_data.unit_types)
20090414 18:34:29 debug engine: Building unit type Gryphon, level 4
20090414 18:34:29 debug config: trying to find Gryphon in unit_type list (unit_type_data.unit_types)
20090414 18:34:29 debug engine: Building unit type Gryphon, level 4
  20090414 18:34:29 { BEGIN: apply mods
  20090414 18:34:29 } END: apply mods (took 0ms)
20090414 18:34:29 debug engine: id: 1313
20090414 18:34:29 error config: invalid move_unit_fake source: 0,0
/Users/ben/projects/wesnoth/MacOSX/../src/unit_display.cpp:128: failed assertion `!path.empty()'