--- /usr/share/archiso/configs/releng/airootfs/root/customize_airootfs.sh	2015-04-16 22:27:36.000000000 +0200
+++ customize_airootfs.sh	2015-04-16 23:48:45.080949574 +0200
@@ -11,7 +11,10 @@
 cp -aT /etc/skel/ /root/
 chmod 700 /root
 
-useradd -m -p "" -g users -G "adm,audio,floppy,log,network,rfkill,scanner,storage,optical,power,wheel" -s /usr/bin/zsh arch
+useradd -m -p "" -g users -G "adm,audio,floppy,log,network,rfkill,scanner,storage,optical,power,wheel" -s /usr/bin/zsh arch || {
+    retval=$?
+    [[ $retval != 9 ]] && exit $retval || :
+}
 
 chmod 750 /etc/sudoers.d
 chmod 440 /etc/sudoers.d/g_wheel