Description of problem:
The plugin has been crashed when I removed it from panel.

Version-Release number of selected component:
xfce4-cellmodem-plugin-0.0.5-7.fc17

Additional info:
libreport version: 2.0.18
abrt_version:   2.0.18
backtrace_rating: 4
cmdline:        /usr/libexec/xfce4/panel-plugins/xfce4-cellmodem-plugin '' 16 25190074 cellmodem 'Cellular Modem Monitor' 'Monitor line quality and type of Cellular Modems' ''
crash_function: cellmodem_t_close_modem
kernel:         3.6.5-1.fc17.i686

truncated backtrace:
:Thread no. 1 (10 frames)
: #1 cellmodem_t_close_modem at cellmodem.c:618
: #2 cellmodem_t_delete at cellmodem.c:592
: #3 g_cclosure_marshal_VOID__VOIDv at gmarshal.c:115
: #4 _g_closure_invoke_va at gclosure.c:840
: #7 xfce_panel_plugin_dispose at xfce-panel-plugin.c:759
: #9 gtk_object_destroy at gtkobject.c:406
: #10 gtk_bin_forall at gtkbin.c:141
: #11 gtk_container_foreach at gtkcontainer.c:1534
: #12 gtk_container_destroy at gtkcontainer.c:1073
: #13 gtk_window_destroy at gtkwindow.c:4440