Critical error

[fanfani]

Nicotine+ version: 3.0.5
Operating System/Distribution: Linux Mint 20.1

Describe the bug

after last Nicotine+ upgrade i often get sudden program crashes. Never happened before latest upgrade.

Expected behavior

don't crash :-)

Steps to reproduce the bug

i don't know, it happens apparently random.

Additional context

Screenshots, logs, stacktraces or relevant information.

Traceback:

Type: <class 'RuntimeError'>
Value: deque mutated during iteration
Traceback:   File "/usr/lib/python3/dist-packages/pynicotine/gtkgui/frame.py", line 601, in on_network_event
    self.np.events[i.__class__](i)
  File "/usr/lib/python3/dist-packages/pynicotine/pynicotine.py", line 831, in conn_close
    self.closed_connection(msg.conn, msg.addr)
  File "/usr/lib/python3/dist-packages/pynicotine/pynicotine.py", line 819, in closed_connection
    self.transfers.conn_close(conn, addr, i.username, error)
  File "/usr/lib/python3/dist-packages/pynicotine/transfers.py", line 1358, in conn_close
    for i in self.uploads:

[mathiascode]

Thanks, this should be fixed in unstable (see #1357). Could you also try the unstable PPA for some time? If everything works well, I'll release Nicotine+ 3.0.6 soon.