gtk import Segmentation fault

When I tried to run my program (ModeRator) I get this error:
/usr/lib64/python2.7/site-packages/gobject/ Warning: g_boxed_type_register_static: assertion `g_type_from_name (name) == 0' failed
import gobject._gobject
/usr/lib64/python2.7/site-packages/gtk-2.0/gtk/ Warning: specified class size for type `PyGtkGenericCellRenderer' is smaller than the parent type's `GtkCellRenderer' class size
from gtk import _gtk
/usr/lib64/python2.7/site-packages/gtk-2.0/gtk/ Warning: g_type_get_qdata: assertion `node != NULL' failed
from gtk import _gtk
Segmentation fault (core dumped)

I ‘fixed’ the problem by disabling the import of matplotlib

It turns out that it is possible to import only one of them:
from gi.repository import GObject, Gtk
import matplotlib.pyplot as plt

Comment out one of these lines end the error is gone!
Better explanation of problems like this is found here:

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Martins M.