Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/deluge/ui/gtk3/listview.py", line 233, in stabilized
    result = sort_func(model, iter1, iter2, data)
  File "/usr/lib/python3/dist-packages/deluge/ui/gtk3/listview.py", line 250, in generic_sort_func
    return cmp(model[iter1][data], model[iter2][data])
  File "/usr/lib/python3/dist-packages/deluge/ui/gtk3/common.py", line 45, in cmp
    return (x > y) - (x < y)
TypeError: '>' not supported between instances of 'NoneType' and 'NoneType'
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/deluge/ui/gtk3/listview.py", line 233, in stabilized
    result = sort_func(model, iter1, iter2, data)
  File "/usr/lib/python3/dist-packages/deluge/ui/gtk3/listview.py", line 250, in generic_sort_func
    return cmp(model[iter1][data], model[iter2][data])
  File "/usr/lib/python3/dist-packages/deluge/ui/gtk3/common.py", line 45, in cmp
    return (x > y) - (x < y)
TypeError: '>' not supported between instances of 'NoneType' and 'NoneType'
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/deluge/ui/gtk3/listview.py", line 233, in stabilized
    result = sort_func(model, iter1, iter2, data)
  File "/usr/lib/python3/dist-packages/deluge/ui/gtk3/listview.py", line 250, in generic_sort_func
    return cmp(model[iter1][data], model[iter2][data])
  File "/usr/lib/python3/dist-packages/deluge/ui/gtk3/common.py", line 45, in cmp
    return (x > y) - (x < y)
TypeError: '>' not supported between instances of 'NoneType' and 'NoneType'
^C
(deluge:17881): Gtk-CRITICAL **: 22:03:24.765: gtk_tree_model_sort_set_sort_column_id: assertion 'header != NULL' failed