I had the same issue on a Hystou P04 and managed to reproduce it several 
times.
Attached to this email is the dump of the installer.

Start the installation process but try to make it fail,
for example by removing the EFI partition during the guided partition,
and when the "Installation failed" menu appear choose "Retrysystem 
install",
on the right. Then restart the installation process with the
same choices and the installer will crash after selecting the keyboard 
layout
variant.

Some time, if you wait for a few minutes before retrying the 
installation, the
crash won't be triggered but then the disk you partitioned during the 
first
installation process won't be available anymore in the disk selection 
menu.

The choices I entered in the installation wizard was:
1. English
2. United States
3. Graphical install
4. Europe
5. Paris
6. English (US)
7. English (intl., with AltGr dead keys)