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TypeError '<' when using zoomify

See original GitHub issue

I’m using

cooler zoomify -r 10000 -o data/Li_et_al_2015.mcool data/Li_et_al_2015.cool

and I’m returning

Traceback (most recent call last):
  File "/opt/conda/bin/cooler", line 8, in <module>
    sys.exit(cli())
  File "/opt/conda/lib/python3.6/site-packages/click/core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "/opt/conda/lib/python3.6/site-packages/click/core.py", line 782, in main
    rv = self.invoke(ctx)
  File "/opt/conda/lib/python3.6/site-packages/click/core.py", line 1259, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/opt/conda/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/opt/conda/lib/python3.6/site-packages/click/core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "/opt/conda/lib/python3.6/site-packages/cooler/cli/zoomify.py", line 146, in zoomify
    agg=agg)
  File "/opt/conda/lib/python3.6/site-packages/cooler/reduce.py", line 679, in zoomify_cooler
    resn, pred, mult = get_multiplier_sequence(resolutions, base_resolutions)
  File "/opt/conda/lib/python3.6/site-packages/cooler/reduce.py", line 366, in get_multiplier_sequence
    resn = np.array(sorted(bases.union(resolutions)))
TypeError: '<' not supported between instances of 'NoneType' and 'int'

The command works with other cool files I’m using, and I’m currently testing this with data I found online, so I don’t know its structure too well. What is going wrong here?