Comment 1 for bug 1490140

I tried to install Grub2 on a USB-3.0 stick.
(https://www.lowlevel.eu/wiki/GRUB_Installation_auf_einem_USB-Stick)

Then started Grub-Customizer, changed environment to my mount points /media/usb/sdb5 and /media/usb/sdb1.

# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 931,5G 0 disk
├─sda1 8:1 0 256M 0 part /boot
├─sda2 8:2 0 1K 0 part
├─sda3 8:3 0 15G 0 part /windows
├─sda4 8:4 0 684,3G 0 part /dos
├─sda5 8:5 0 28G 0 part /
├─sda6 8:6 0 200G 0 part /home
└─sda7 8:7 0 4G 0 part [SWAP]
sdb 8:16 1 57,9G 0 disk
├─sdb1 8:17 1 512M 0 part /media/usb/sdb1
├─sdb4 8:20 1 1K 0 part
├─sdb5 8:21 1 30G 0 part /media/usb/sdb5
└─sdb6 8:22 1 27,3G 0 part /media/usb/sdb6
sr0 11:0 1 1024M 0 rom

=> Grub-Customizer crashed.

# grub-customizer
 *** initializing (w/o specified bootloader type)…
   * reading partition info…
   * Loading Framebuffer resolutions (background process)
   * Finding out if this is a live CD
 *** initializing (w/ specified bootloader type)…
   * Checking if the config directory is clean
 *** loading configuration
 *** loading - preserveConfig: no
   * unsetting saved config
 *** loading settings
 *** loading grub list
   * loading scripts…
   * loading proxies…
   * cleaning up proxy configuration…
   * creating proxifiedScript links & chmodding other files…
   * running grub-mkconfig
   * restoring grub configuration
   * removing invalid proxies from list
   * loading completed
 *** grub list completely loaded
 *** loading saved grub list

(grub-customizer:16030): glibmm-ERROR **:
unhandled exception (type std::exception) in signal handler:
what: basic_string::substr: __pos (which is 27) > this->size() (which is 21)

Trace/Breakpoint ausgelöst (Speicherabzug geschrieben)

=> From now on Grub-Customizer crashes always immediately after I launch it.
Any idea / help ?