GNU solfege displays splash window, but then crashes:

$ solfege --debug
cfg var app/learningtree did not unpack as a 2 elem tuple: ''
Traceback (most recent call last):
File "/usr/bin/solfege", line 83, in <module>
solfege.mainwin.start_app(os.path.join(prefix, "share", "solfege"))
File "/usr/share/solfege/solfege/mainwin.py", line 1134, in start_app
solfege.win = w = MainWin(options, datadir, lessonfile_manager)
File "/usr/share/solfege/solfege/mainwin.py", line 529, in __init__
self.on_learning_tree_changed()
File "/usr/share/solfege/solfege/mainwin.py", line 597, in on_learning_tree_changed
self.display_frontpage()
File "/usr/share/solfege/solfege/mainwin.py", line 1041, in display_frontpage
self.get_view().display_data(data)
File "/usr/share/solfege/solfege/mainwin.py", line 434, in display_data
self._display_data(data, display_only_tests)
File "/usr/share/solfege/solfege/mainwin.py", line 334, in _display_data
label = gu.ClickableLabel(_no_xgettext(link.m_name))
File "/usr/share/solfege/solfege/gu.py", line 829, in __init__
self.get_children()[0].set_alignment(0.0, 0.5)
IndexError: list index out of range
$

It worked few weeks ago.

Solfege version: 3.15.2-1
Pygkt version: 2.16.0-2
Python version: 2.6.4-1