Thanks for the crash report. Yeah it seems to be a problem with Qt sockets on ARM Macs that's not unique to SoulseekQt. There's a report of it here for example:
I'll post a build that uses the latest Qt later today. Newer versions of Qt often have better support for ARM Macs, but it's a shot in the dark and if I had to guess it probably won't solve the problem. Still it's worth a shot.
If that doesn't work I can look into replacing Qt sockets with something like the Asio networking library, but it's a big project and it'll take a while to get it done if it's doable.
Will post the aforementioned build soon.