@ArTourter (or anyone else) Can you reproduce the crash in the debugger and run the commands I posted in the GitHub issue ticket?
First you might have to switch context, see:
https://github.com/pi-hole/FTL/issues/718#issuecomment-607182704
Then run
p linebuffer
p num
p ip
p iface
p hwaddr
This hopefully gives some hint to what is failing...