Create a signal with Gtkmm

i am using the gtkmm library with C++ and i am trying to create a signal wich allow to change of tab but it does not work. Actually i think the problem comes from this line :

menuit->signal_activate().connect([&bo]() {bo->next_page();}); 

where

menuit = Gtk::MenuItem

bo = Gtk::Notebook

When i compile it is perfect but when i execute the file i have this line :

Segmentation fault
(program exited with code: 139)

Thank you a lot for your help !