crashes when reporting some packages

Binary package hint: apport

It happens with some packages. Trying to report a gdm bug:

snifer@snifer-laptop:~$ ubuntu-bug -p gdm
Traceback (most recent call last):
  File "/usr/share/apport/apport-gtk", line 252, in <module>
    app.run_argv()
  File "/var/lib/python-support/python2.5/apport/ui.py", line 230, in run_argv
    self.run_report_bug()
  File "/var/lib/python-support/python2.5/apport/ui.py", line 222, in run_report_bug
    self.collect_info()
  File "/var/lib/python-support/python2.5/apport/ui.py", line 317, in collect_info
    icthread.exc_raise()
  File "/var/lib/python-support/python2.5/apport/REThread.py", line 37, in run
    self._retval = self.__target(*self.__args, **self.__kwargs)
  File "/var/lib/python-support/python2.5/apport/ui.py", line 37, in thread_collect_info
    report.add_package_info(package)
  File "/var/lib/python-support/python2.5/apport/report.py", line 223, in add_package_info
    _transitive_dependencies(package, dependencies)
  File "/var/lib/python-support/python2.5/apport/report.py", line 47, in _transitive_dependencies
    _transitive_dependencies(d, depends_set)
  File "/var/lib/python-support/python2.5/apport/report.py", line 44, in _transitive_dependencies
    for d in packaging.get_dependencies(package):
  File "/var/lib/python-support/python2.5/apport/packaging_impl.py", line 65, in get_dependencies
    return [d[0].TargetPkg.Name for d in cur_ver.DependsList.get('Depends', []) +
AttributeError: 'NoneType' object has no attribute 'DependsList'

ProblemType: Bug
ApportLog:
 apport (pid 5894) Mon Jun 18 22:41:48 2007: called for pid 5892, signal 11
 apport (pid 5894) Mon Jun 18 22:41:49 2007: executable: /usr/bin/gdm-signal (command line "gdm-signal -help")
 modinfo: could not open cdrom: No such device
 modinfo: could not open cdrom: No such device
 apport (pid 5894) Mon Jun 18 22:41:49 2007: wrote report /var/crash/_usr_bin_gdm-signal.1000.crash
Architecture: i386
CrashReports:
 600:1000:1000:10018:2007-06-18 15:28:20.000000000 -0400:2007-06-18 22:45:08.000000000 -0400:/var/crash/_usr_bin_compiz.real.1000.crash
 600:1000:1000:8628:2007-06-18 22:41:49.000000000 -0400:2007-06-18 22:45:19.000000000 -0400:/var/crash/_usr_bin_gdm-signal.1000.crash
 600:0:0:16077:2007-06-15 16:35:27.000000000 -0400:2007-06-15 16:35:25.000000000 -0400:/var/crash/_usr_bin_software-properties-gtk.0.crash
 600:0:0:18476:2007-06-18 15:01:38.000000000 -0400:2007-06-18 15:00:29.000000000 -0400:/var/crash/_usr_bin_update-manager.0.crash
 600:1000:1000:25912:2007-06-18 23:18:20.000000000 -0400:2007-06-18 23:19:03.000000000 -0400:/var/crash/_usr_share_apport_apport-gtk.1000.crash
Date: Mon Jun 18 23:25:01 2007
DistroRelease: Ubuntu 7.10
Package: apport 0.84
PackageArchitecture: all
SourcePackage: apport
Uname: Linux snifer-laptop 2.6.22-6-generic #1 SMP Fri Jun 1 19:24:12 GMT 2007 i686 GNU/Linux