Comment 1 for bug 1767051

My grub-customizer released (not custom built) for Fedora 28 fails with the same message.

[steve@colt ~]$ uname -a
Linux colt 4.16.6-302.fc28.x86_64 #1 SMP Wed May 2 00:07:06 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux

[steve@colt ~]$ sudo grub-customizer
[sudo] password for steve:
 *** initializing (w/o specified bootloader type)…
   * reading partition info…
/usr/include/c++/8/bits/basic_string.h:1048: std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::reference std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::operator[](std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type) [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::reference = char&; std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type = long unsigned int]: Assertion '__pos <= size()' failed.
Aborted

[steve@colt ~]$ sudo dnf info grub-customizer
Failed to synchronize cache for repo 'virtualbox', disabling.
Last metadata expiration check: 0:12:24 ago on Tue 08 May 2018 13:52:35 AEST.
Installed Packages
Name : grub-customizer
Version : 5.0.6
Release : 7.fc28
Arch : x86_64
Size : 2.7 M
Source : grub-customizer-5.0.6-7.fc28.src.rpm
Repo : @System
From repo : fedora
Summary : Graphical GRUB2 settings manager
URL : https://launchpad.net/grub-customizer
License : GPLv3
Description : Grub Customizer is a graphical interface to configure the grub2/burg settings
             : with focus on the individual list order - without losing the dynamical behavior
             : of grub.
             :
             : The goal of this project is to create a complete and intuitive graphical
             : grub2/burg configuration interface. The main feature is the boot entry list
             : configuration - but not simply by modified the grub.cfg: to keep the dynamical
             : configuration, this application will only edit the script order and generate
             : proxies (script output filter), if required.