Description of problem:
Start application
Insert activity
then program crash


Version-Release number of selected component:
planner-0.14.6-6.fc18

Additional info:
libreport version: 2.0.18
abrt_version:   2.0.18
backtrace_rating: 4
cmdline:        planner
crash_function: planner_task_tree_create_new_position
kernel:         3.6.7-1.fc18.i686.PAE

truncated backtrace:
:Thread no. 1 (10 frames)
: #0 planner_task_tree_create_new_position at planner-task-tree.c:2862
: #1 planner_task_tree_insert_task at planner-task-tree.c:2914
: #2 task_view_insert_task_cb at planner-task-view.c:469
: #8 _gtk_action_emit_activate at gtkaction.c:795
: #9 gtk_action_activate at gtkaction.c:826
: #16 gtk_widget_activate at gtkwidget.c:5048
: #17 gtk_menu_shell_activate_item at gtkmenushell.c:1283
: #18 gtk_menu_shell_button_release at gtkmenushell.c:710
: #19 gtk_menu_button_release at gtkmenu.c:3043
: #21 _gtk_marshal_BOOLEAN__BOXED at gtkmarshalers.c:86