Comment 1 for bug 1569565

Should have mentioned, I'm running --
LinuxMint Rosa 17.3 - KDE
Grub Customizer, most recent version, 5.0.5 .
and in this crashed condition, top shows 'kio_filenamesea' to be running and using 99.6% CPU.

After killing the above process and restarting the Customizer, the menu entry for Linux Mint is back to its 'pre-edit' (attempt) condition, and that is:
Linux Mint 17.3 KDE 32-bit, 3.13.0-24-generic (/dev/sda3)