# Buggy code
def OnSave(self, widget):
    sharesdir = os.path.join(self.data_dir, "usershares")

    try:
        if not os.path.exists(sharesdir):
            os.mkdir(sharesdir)
    except Exception as msg:
        error = _(
            "Can't create directory '%(folder)s', reported error: %(error)s"
            % {"folder": sharesdir, "error": msg}
        )
        self.frame.logMessage(error)

    try:
        import pickle as mypickle
        import bz2

        sharesfile = bz2.BZ2File(os.path.join(sharesdir, CleanFile(self.user)), "w")
        mypickle.dump(self.shares, sharesfile, mypickle.HIGHEST_PROTOCOL)
        sharesfile.close()
    except Exception as msg:
        error = _(
            "Can't save shares, '%(user)s', reported error: %(error)s"
            % {"user": self.user, "error": msg}
        )
        self.frame.logMessage(error)


# Traceback (SystemError)
Thu 07:58 Nicotine+ supports a country code blocker. This requires a (GPL'ed) library called GeoIP. You can find it here: C library:       https://github.com/maxmind/geoip-api-c Python
bindings: https://github.com/maxmind/geoip-api-python (the python bindings require the C library)
Traceback (most recent call last):
File "/usr/local/bin/nicotine", line 255, in <module>
run()
File "/usr/local/bin/nicotine", line 231, in run
app = frame.MainApp(data_dir, config, plugins, trayicon, hidden, bindip, port)
File "/usr/local/lib/python3.7/site-packages/pynicotine/gtkgui/frame.py", line 3595, in __init__
self.frame = NicotineFrame(data_dir, config, plugins, trayicon, start_hidden, bindip, port)
File "/usr/local/lib/python3.7/site-packages/pynicotine/gtkgui/frame.py", line 273, in __init__
config
File "/usr/local/lib/python3.7/site-packages/pynicotine/pynicotine.py", line 130, in __init__
self.shares = Shares(self)
File "/usr/local/lib/python3.7/site-packages/pynicotine/shares.py", line 75, in __init__
self.CompressShares("normal")
File "/usr/local/lib/python3.7/site-packages/pynicotine/shares.py", line 201, in CompressShares
m.makeNetworkMessage(nozlib=0, rebuild=True)
File "/usr/local/lib/python3.7/site-packages/pynicotine/slskmessages.py", line 1709, in makeNetworkMessage
msg = msg + self.packObject(len(list(self.list.keys())))
File "/usr/local/lib/python3.7/_collections_abc.py", line 720, in __iter__
yield from self._mapping
File "/usr/local/lib/python3.7/shelve.py", line 95, in __iter__
for k in self.dict.keys():
SystemError: Negative size passed to PyBytes_FromStringAndSize

# Fixed code
def OnSave(self, widget):
    sharesdir = os.path.join(self.data_dir, "usershares")

    try:
        if not os.path.exists(sharesdir):
            os.mkdir(sharesdir)
    except Exception as msg:
        error = _(
            "Can't create directory '%(folder)s', reported error: %(error)s"
            % {"folder": sharesdir, "error": msg}
        )
        self.frame.logMessage(error)

    try:
        import pickle as mypickle
        import bz2

        sharesfile = bz2.BZ2File(os.path.join(sharesdir, CleanFile(self.user)), "w")
        mypickle.dump(self.shares, sharesfile, protocol=mypickle.HIGHEST_PROTOCOL)
        sharesfile.close()
    except Exception as msg:
        error = _(
            "Can't save shares, '%(user)s', reported error: %(error)s"
            % {"user": self.user, "error": msg}
        )
        self.frame.logMessage(error)