Hi Damian,
it looks like the problem does not occur anymore in the upcoming 3.6.2. I tried the autofocus routine with a setup without a filter wheel and did not experience a crash.

Give it a try to compile KStars from sources, it's not that difficult for people who could use gdb :-)

If you need assistance, take a look here invent.kde.org/education/kstars/-/tree/master#building

HTH
Wolfgang

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