TypeError: could not convert path to a GtkTreePath

[Muelli]

when logging in.

Traceback (most recent call last):
  File "/usr/share/gajim/src/roster_window.py", line 4284, in on_modelfilter_row_has_child_toggled
    self._adjust_group_expand_collapse_state(group, account)
  File "/usr/share/gajim/src/roster_window.py", line 1552, in _adjust_group_expand_collapse_state
    self.tree.expand_row(path, False)
TypeError: could not convert path to a GtkTreePath

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: gajim 0.16-1
ProcVersionSignature: Ubuntu 3.19.0-9.9-generic 3.19.1
Uname: Linux 3.19.0-9-generic x86_64
ApportVersion: 2.16.2-0ubuntu3
Architecture: amd64
CurrentDesktop: GNOME
Date: Mon Mar 23 16:14:00 2015
PackageArchitecture: all
SourcePackage: gajim
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniel (wurstsalat3000)]

Please upgrade to a recent version of Gajim.