xserver crash with two wiimotes working as two mouses

[ulihox]

I'm using Ubuntu 14.04 and last git version of xwiimote and xf86-input-xwiimote. I want to get two wiimotes working as two mouses (at the same time).

/usr/X11/xorg.conf.d/60-xwiimote.conf is:
Section "InputClass"
Identifier "Nintendo Wii Remote"
MatchProduct "Nintendo Wii Remote"
MatchDevicePath "/dev/input/event*"
Option "Ignore" "off"
Option "MotionSource" "ir"
Driver "xwiimote"
Option "MapA" "right-button"
Option "MapB" "left-button"
EndSection

I use the following xinput commands to get a second pointer:
$ xinput create-master ADDITIONAL
$ xinput reattach #ID_WIIMOTE1 #ID_ADDITIONAL

When I press A or B button, xorg crash. If I don't map A and B button, the two pointers works perfectly.