deluge crashed during blocklist import

Binary package hint: deluge-torrent

In version 0.5.4.1, after typing "deluge" at the command prompt:

no existing Deluge session
Starting new Deluge session...
deluge_core; using libtorrent 0.13.0.0. Compiled with NDEBUG.
Applying preferences
Capping download to -1 bytes per second
Capping upload to -1 bytes per second
Pickling state...
Scanning plugin dir /usr/share/deluge/plugins
Initialising plugin Locations
Initialising plugin TorrentCreator
Initialising plugin NetworkHealth
Initialising plugin DesiredRatio
Initialising plugin NetworkGraph
Initialising plugin TorrentFiles
Initialising plugin EventLogging
Initialising plugin BlocklistImport
Initialising plugin TorrentSearch
Initialising plugin SimpleRSS
Initialising plugin TorrentPieces
Initialising plugin SpeedLimiter
Initialising plugin TorrentNotification
Initialising plugin ExtraStats
Initialising plugin TorrentPeers
Applying preferences
Starting DHT...
Capping download to -1 bytes per second
Capping upload to -1 bytes per second
Showing window
Loading blocklist plugin ...
Fetching http://www.bluetack.co.uk/config/nipfilter.dat.gz
/usr/share/deluge/plugins/BlocklistImport/ui.py:124: GtkWarning: gtk_progress_set_percentage: assertion `percentage >= 0 && percentage <= 1.0' failed
  self.progress.set_fraction(fract)
importing with gzmule
GZMuleReader loading /home/mairw/.config/deluge/blocklist.cache
MuleReader loading
TextBase loading
Starting import
Traceback (most recent call last):
  File "/usr/bin/deluge", line 140, in <module>
    start_deluge()
  File "/usr/bin/deluge", line 129, in start_deluge
    interface.start(options.tray, get_cmd_line_torrents())
  File "/var/lib/python-support/python2.5/deluge/interface.py", line 840, in start
    self.load_plugins()
  File "/var/lib/python-support/python2.5/deluge/interface.py", line 858, in load_plugins
    self.plugins.enable_plugin("Blocklist Importer")
  File "/var/lib/python-support/python2.5/deluge/plugins.py", line 75, in enable_plugin
    self.enabled_plugins[name] = plugin.enable(self.core, self.interface)
  File "/usr/share/deluge/plugins/BlocklistImport/__init__.py", line 29, in enable
    return BlocklistImport(path, core, interface)
  File "/usr/share/deluge/plugins/BlocklistImport/__init__.py", line 67, in __init__
    self.loadlist(fetch=self.config.get('load_on_start'))
  File "/usr/share/deluge/plugins/BlocklistImport/__init__.py", line 104, in loadlist
    ips = reader.next()
  File "/usr/share/deluge/plugins/BlocklistImport/text.py", line 31, in next
    txt = self.fd.readline()
  File "/usr/lib/python2.5/gzip.py", line 399, in readline
    c = self.read(readsize)
  File "/usr/lib/python2.5/gzip.py", line 227, in read
    self._read(readsize)
  File "/usr/lib/python2.5/gzip.py", line 263, in _read
    self._read_gzip_header()
  File "/usr/lib/python2.5/gzip.py", line 164, in _read_gzip_header
    raise IOError, 'Not a gzipped file'
IOError: Not a gzipped file