Gtk3, Python and omnicomplete

Hello,

I'm having problems with omni completion and Python if importing gtk3/gobject classes. Since having imported via
from gi.repository import Gtk (etc.)
to use gtk3, omni complete starts complaining with errors like
Warning: cannot register existing type `GtkWidget'

Is there any solution? Or can anyone give me hint what to look up in vim's help?
If there is no 'proper' solution, how can I make vim stop trying to look up the gtk files, so that -at least- vim won't crash.

Thank you.

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