Comment 11 for bug 1763986

Yeap the issue is still present on version 5.2.1 and it happened to me after kde neon distro upgrade, also there are duplicated entries on grub.

I got exception '9Exception'
with message 'Assertion `script != nullptr' failed. Function: appendRuleToView' in /build/grub-customizer-VULDrI/grub-customizer-5.2.1/src/maim/../ Controller/MainController.hpp:1036

All references in /etc/grub.d/.script_sources.txt exist in /etc/grub.d

.script_sources.txt contains

"current_name";"default_name"
"proxifiedScripts/linux";"10_linux"
"21_memtest86+";"20_memtest86+"
"proxifiedScripts/os-prober";"30_os-prober"
"proxifiedScripts/uefi-firmware";"30_uefi-firmware"

and in /etc/grub.d there are these files

00_header 20_linux_xen 30_os-prober_proxy 40_custom proxifiedScripts
05_debian_theme 20_memtest86+ 30_uefi-firmware 41_custom README
10_linux 21_memtest86+ 33_linux_proxy
10_linux_zfs 30_os-prober 35_fwupd

what should I check for the duplicates and what should I do about the 9Exception?