Comment 2 for bug 1720906

StacktraceTop:
 get_shadow_width (window=0x0, shadow_width=shadow_width@entry=0x7fff30021ff8) at ././gtk/gtkwindow.c:6867
 _gtk_window_get_shadow_width (window=<optimized out>, border=border@entry=0x7fff30021ff8) at ././gtk/gtkwindow.c:12347
 gtk_menu_position_legacy (set_scroll_offset=1, menu=0x5629567ba2c0) at ././gtk/gtkmenu.c:4921
 gtk_menu_position (menu=menu@entry=0x5629567ba2c0, set_scroll_offset=set_scroll_offset@entry=1) at ././gtk/gtkmenu.c:5231
 gtk_menu_popup_internal (menu=0x5629567ba2c0, device=<optimized out>, parent_menu_shell=<optimized out>, parent_menu_item=<optimized out>, func=<optimized out>, data=<optimized out>, destroy=<optimized out>, button=<optimized out>, activate_time=<optimized out>) at ././gtk/gtkmenu.c:1977