Hi Igor,
Initialize the GValue structure and see if that does the trick for getting the value.
GValue value=G_VALUE_INIT;
https://developer.gnome.org/gobject/stable/gobject-Generic-values.html#G-VALUE-INIT:CAPS
If that doesn't work, check the return value of gtk_tree_model_get_iter() to make sure that your iter is good.
Eric
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