[Gtk-sharp-list] gtk_text_attributes_ref: assertion `values != NULL' failed

[wizir]

hello, i've tried add dynamically tab (with Gtk.TextView) into the
Gtk.Notebook, but sometimes i have an error like this
gtk_text_attributes_ref: assertion `values != NULL' failed
anyone knows what does it mean?
i'll be appreciate for any suggestions
best regards
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