You only connect the signal handler that does the print, if the Builder returned a non-null pointer. Have you checked whether the Builder actually returns a non-null pointer, i.e. successfully looks up the widget with name Product_Combo to m_combo!?
I would recommend, as always, assert()ing that all points are non-nullptr before dereferencing them, and if possible compiling with UBsan so that it can often catch that if you don't.
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