Description of problem:
Happens on start-up after having used it before.

Version-Release number of selected component:
gtg-0.3-4.fc20

Additional info:
reporter:       libreport-2.1.9
cmdline:        /usr/bin/python /usr/bin/gtg
executable:     /usr/bin/gtg
kernel:         3.11.7-300.fc20.x86_64
runlevel:       N 5
type:           Python
uid:            1001

Truncated backtrace:
browser.py:521:restore_state_from_conf:AttributeError: 'NoneType' object has no attribute 'expand_node'

Traceback (most recent call last):
  File "/usr/bin/gtg", line 85, in <module>
    main()
  File "/usr/bin/gtg", line 81, in main
    sys.exit(gtg.main(options, args))
  File "/usr/lib/python2.7/site-packages/GTG/gtg.py", line 120, in main
    manager = Manager(req)
  File "/usr/lib/python2.7/site-packages/GTG/gtk/manager.py", line 75, in __init__
    self.browser = TaskBrowser(self.req, self)
  File "/usr/lib/python2.7/site-packages/GTG/gtk/browser/browser.py", line 129, in __init__
    self.restore_state_from_conf()
  File "/usr/lib/python2.7/site-packages/GTG/gtk/browser/browser.py", line 521, in restore_state_from_conf
    self.tagtreeview.expand_node(path)
AttributeError: 'NoneType' object has no attribute 'expand_node'

Local variables in innermost frame:
ypos: 59
width: 590
tag_pane: False
path_t: "('search',)"
xpos: 1
closed_task_pane: True
botpos: 331
self: <TaskBrowser object at 0x1825640 (GTG+gtk+browser+browser+TaskBrowser at 0xec52e0)>
p: ''
sort_order: 1
sidebar_width: 252
toolbar: False
path: ('search',)
model: <TreeModel object at 0x1825870 (GtkTreeStore at 0x18fac90)>
height: 590
sort_column: 6
quickadd_pane: True

Potential duplicate: bug 893351