Why does firewall-config give "Gtk-CRITICAL **: gtk_tree_view_get_path_at_pos: assertion 'tree_view != NULL' failed" error?

Solution In Progress - Updated -

Issue

  • Why does firewall-config give following error at launch?

    firewall-config: Gtk-CRITICAL **: gtk_tree_view_get_path_at_pos: assertion 'tree_view != NULL' failed 
    

Environment

  • Red Hat Enterprise Linux 7
  • gtk3

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