Comment 2 for bug 1418014

StacktraceTop:
 __assert_fail_base (fmt=0xb766a9d4 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", assertion=assertion@entry=0xb76c8337 "renderer != ((void *)0)", file=file@entry=0xb76c8328 "ply-renderer.c", line=line@entry=327, function=function@entry=0xb76c87e0 <__PRETTY_FUNCTION__.5835> "ply_renderer_get_buffer_for_head") at assert.c:92
 __GI___assert_fail (assertion=0xb76c8337 "renderer != ((void *)0)", file=0xb76c8328 "ply-renderer.c", line=327, function=0xb76c87e0 <__PRETTY_FUNCTION__.5835> "ply_renderer_get_buffer_for_head") at assert.c:101
 ply_renderer_get_buffer_for_head (renderer=0x0, head=0x997c398) at ply-renderer.c:327
 ply_pixel_display_draw_area (display=0x9978770, x=459, y=398, width=21, height=21) at ply-pixel-display.c:144
 draw_area (data=<optimized out>, height=<optimized out>, width=<optimized out>, y=<optimized out>, x=<optimized out>) at ./script-lib-sprite.c:537