Unagi Compositing Manager

I open awesome's awful.menu and move my mouse around wildly. After a couple of attempts, valgrind tells me:

DEBUG: event_handle_destroy_notify:479: DestroyNotify: parent=111, window=2035fc
DEBUG: event_handle_create_notify:443: CreateNotify: parent=111, window=20367b (100x19 +427 +181)
WARN: window_add_requests_finalise:384: GetWindowAttributes failed for window 20367b
WARN: event_handle_create_notify:450: Can't create window 20367b
DEBUG: event_handle_map_notify:510: MapNotify: event=111, window=20367b
==21977== Invalid read of size 8
==21977==    at 0x4050CF: event_handle_map_notify (event.c:513)
==21977==    by 0x5641C6A: xcb_event_poll_for_event_loop (event.c:98)
==21977==    by 0x407BDE: main (unagi.c:383)
==21977==  Address 0x8 is not stack'd, malloc'd or (recently) free'd