Description of Problem:

I get this warning sometimes when I close a dialog tab in xchat

How Reproducible:

Semi

Steps to Reproduce:
1. open a bunch of channel windows and some dialog windows
2. close them
3. this warning is printed on the console

Actual Results:

Gtk-CRITICAL **: file gtkclist.c: line 2654 (gtk_clist_clear): assertion
`clist != NULL' failed.

Gtk-CRITICAL **: file gtklabel.c: line 261 (gtk_label_set_text): assertion
`GTK_IS_LABEL (label)' failed.

Gtk-CRITICAL **: file gtklabel.c: line 261 (gtk_label_set_text): assertion
`GTK_IS_LABEL (label)' failed.

Gtk-CRITICAL **: file gtklabel.c: line 261 (gtk_label_set_text): assertion
`GTK_IS_LABEL (label)' failed.

Gtk-CRITICAL **: file gtkwidget.c: line 1427 (gtk_widget_show): assertion
`widget != NULL' failed.

Expected Results:

No warnings printed.

Additional Information:

None