Is this a bug?

[198710 <bosomfriend198710 yahoo com cn>]

……
GtkWidget *file_chooser_dialog;
……
gtk_widget_destroy (file_chooser_dialog);/*error message at this line*/

On Windows Vista(SP1),I run the program step by step,and see an error
message "GLib-GObject-CRITICAL **: g_object_unref: assertion 'G_IS_OBJECT
(object)' failed" occurs.
However,the same code runs with no error under Ubuntu 8.04!
So I'm wondering if it's a bug of gtk_widget_destroy?
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