SUMMARY
Live installer crashed when I selected a FAT16 partition, and clicked Change....
I wanted to select it for EFI System Partition (for boot loader).

Int -> Bool, seems to be a coding problem.

STEPS TO REPRODUCE
Didn’t happen again. Probably only happens when one directly clicks on the “FAT16” text, as it checks for index.column() == 3.

OBSERVED RESULT
See below

SOFTWARE/OS VERSIONS
KDE Neon installer as downloaded end of March 2019. Not updated yet.

Operating System: KDE neon 5.15
KDE Plasma Version: 5.15.3
KDE Frameworks Version: 5.56.0
Qt Version: 5.12.0
Kernel Version: 4.18.0-16-generic
OS Type: 64-bit
Processors: 2 × AMD E-450 APU with Radeon(tm) HD Graphics
Memory: 7.4 GiB
Computer: Lenovo Ideapad s205 :/


ADDITIONAL INFORMATION
Traceback (most recent call last):
  File "/usr/lib/ubiquity/ubiquity/frontend/kde_components/PartitionModel.py", line 66, in setData
    item.partman_column_format_toggled(value.toBool())
AttributeError: 'int' object has no attribute 'toBool'