Newbie question

[Sven Garbade <garbade psy uni-muenchen de>]

Hi there,

I've just started to develop a small application using gtk+ (version
1.2.8). All seems to work fine, but I'm wondering about this message:

** CRITICAL **: file gtkdatabox.c: line 1723
(gtk_databox_data_destroy_all_with_flag): assertion
`GTK_IS_DATABOX(box)' failed.

[this comes 15 times]

It appears when I close a window in which some data is drawn (using
gtkdatabox) via a "close" dialog. What does this message mean and is it
crucial?

Thanks, Sven

P.S.: I can send some code if it's nessessary.