Unexpected mount in chroot

[Rom888]

Hi,
Thank you for this script!

I use truecrypt, and when I mount a volume and vpn.sh is active, that volume is mounted into the main Ubuntu system and chroot too:
$ mount

...
truecrypt on /tmp/.truecrypt_aux_mnt2 type fuse.truecrypt (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other)
truecrypt on /opt/chroot/tmp/.truecrypt_aux_mnt2 type fuse.truecrypt (rw,nosuid,nodev,relatime,user_id=0,group_id=0,allow_other)
/dev/mapper/truecrypt2 on /media/z type exfat (rw,relatime,uid=1000,gid=1000,fmask=0077,dmask=0077,iocharset=utf8,errors=remount-ro)

$ truecrypt -l

2: /mnt/d/w-win.dat /dev/mapper/truecrypt2 /media/z
2: /mnt/d/w-win.dat /dev/mapper/truecrypt2 /media/z

How can I prevent a volume from being mounted in a chroot?