crash when update launcher in awn-manager

LFS Distribution
AWN build from source 0.3.2.1
I use XFCE

When moving or adding a launcher in awm-manager i got a crash.

*** glibc detected *** /usr/local/bin/avant-window-navigator: double free or corruption (fasttop): 0x0000000000793c70 ***

Here the gdb backtrace :
#0 0x00007fb7b7fc8a0a in raise () from /lib/libc.so.6
#1 0x00007fb7b7fca260 in abort () from /lib/libc.so.6
#2 0x00007fb7b8001eea in __libc_message () from /lib/libc.so.6
#3 0x00007fb7b8008cca in _int_free () from /lib/libc.so.6
#4 0x00007fb7b800c65c in free () from /lib/libc.so.6
#5 0x00007fb7b85aebc7 in g_free () from /usr/lib/libglib-2.0.so.0
#6 0x0000000000416350 in awn_task_manager_refresh_launchers (entry=<value optimized out>, task_manager=0x74d000)
    at awn-task-manager.c:1500
#7 0x00007fb7bec520af in awn_config_client_notify_proxy (client=0x66e120, cid=<value optimized out>, entry=0x770cc0, notify=0x74f4a0)
    at awn-config-client-gconf.c:114
#8 0x00007fb7b9752739 in gconf_listeners_notify () from /usr/lib/libgconf-2.so.4
#9 0x00007fb7b975f06a in notify_one_entry () from /usr/lib/libgconf-2.so.4
#10 0x00007fb7b975fe82 in notify_idle_callback () from /usr/lib/libgconf-2.so.4
#11 0x00007fb7b85a84fb in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#12 0x00007fb7b85a8cfd in g_main_context_iterate () from /usr/lib/libglib-2.0.so.0
#13 0x00007fb7b85a8fca in g_main_loop_run () from /usr/lib/libglib-2.0.so.0
#14 0x00007fb7bc9e1eb4 in gtk_main () from /usr/lib/libgtk-x11-2.0.so.0
#15 0x0000000000409a5a in main (argc=1, argv=0x7fff9be8da18) at main.c:355

i took a look and it's seem some file variable in awn-task-manager.c line 1487 don't containt file but some memory information i think.