Bug : X crash with some software such as nvidia-settings or nitrogen

[Minims]

GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu1) 7.4-2012.04
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://bugs.launchpad.net/gdb-linaro/>...
Reading symbols from /usr/local/bin/wmfs...(no debugging symbols found)...done.
(gdb) 
(gdb) run
Starting program: /usr/local/bin/wmfs 
wmfs: /home/alex/.config/wmfs/wmfsrc read
wmfs: /home/alex/.config/wmfs/conf.d/bars read
wmfs: /home/alex/.config/wmfs/conf.d/client read
wmfs: /home/alex/.config/wmfs/conf.d/keys read
wmfs: /home/alex/.config/wmfs/conf.d/launchers read
wmfs: /home/alex/.config/wmfs/conf.d/rules read
wmfs: /home/alex/.config/wmfs/conf.d/tags read
wmfs: /home/alex/.config/wmfs/conf.d/themes read
wmfs: Can't load font 'snap'
wmfs: Can't load font 'snap'
wmfs: Can't load font 'snap'

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff7ad2e87 in XNextEvent () from /usr/lib/x86_64-linux-gnu/libX11.so.6
(gdb) bt
#0  0x00007ffff7ad2e87 in XNextEvent () from /usr/lib/x86_64-linux-gnu/libX11.so.6
#1  0x000000000041c000 in wmfs_loop ()
Backtrace stopped: previous frame inner to this frame (corrupt stack?)
(gdb)

[Minims]

I've tried on different hardware and VM. With Ubuntu 12.04 i386 no problem. Latest version of 12.04 LTS AMD64, still same problem. I'm checking on Debian Wheezy

[Minims]

Ok on Debian Wheezy