[pygtk] GtkWarning: gtk_cell_editable_remove_widget: assertion `GTK_IS_CELL_EDITABLE (cell_editable)' failed

[Mate Spoja]

Hello,
I have editable treeview. When i press tab while editing cell i get this
warning:
"GtkWarning: gtk_cell_editable_remove_widget: assertion
`GTK_IS_CELL_EDITABLE (cell_editable)' failed".
Immediately after warning app crashes with segmantation fault error.
Thanks for help!
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