paxer failure with old .ini file

gistfile1.txt

Traceback (most recent call last):
  File "/project/lgrandi/anaconda3/bin/paxer", line 4, in <module>
    __import__('pkg_resources').run_script('pax==3.3.0', 'paxer')
  File "/project/lgrandi/anaconda3/lib/python3.4/site-packages/setuptools-18.1-py3.4.egg/pkg_resources/__init__.py", line 735, in run_script
  File "/project/lgrandi/anaconda3/lib/python3.4/site-packages/setuptools-18.1-py3.4.egg/pkg_resources/__init__.py", line 1652, in run_script
  File "/project/lgrandi/anaconda3/lib/python3.4/site-packages/pax-3.3.0-py3.4.egg/EGG-INFO/scripts/paxer", line 462, in <module>
    main()
  File "/project/lgrandi/anaconda3/lib/python3.4/site-packages/pax-3.3.0-py3.4.egg/EGG-INFO/scripts/paxer", line 277, in main
    pax_instance.run()
  File "/project/lgrandi/anaconda3/lib/python3.4/site-packages/pax-3.3.0-py3.4.egg/pax/core.py", line 502, in run
    self.shutdown()
  File "/project/lgrandi/anaconda3/lib/python3.4/site-packages/pax-3.3.0-py3.4.egg/pax/core.py", line 513, in shutdown
    ap.shutdown()
  File "/project/lgrandi/anaconda3/lib/python3.4/site-packages/pax-3.3.0-py3.4.egg/pax/plugins/io/Table.py", line 188, in shutdown
    self._write_to_disk()
  File "/project/lgrandi/anaconda3/lib/python3.4/site-packages/pax-3.3.0-py3.4.egg/pax/plugins/io/Table.py", line 178, in _write_to_disk
    v in self.data.items()})
  File "/project/lgrandi/anaconda3/lib/python3.4/site-packages/pax-3.3.0-py3.4.egg/pax/formats.py", line 214, in write_data
    dtype=[('temp_name', dtype, (array_len,),)])
TypeError: Empty data-type
Exception ignored in: <bound method TableWriter.__del__ of <Table.TableWriter object at 0x7fb4f6df0c50>>
Traceback (most recent call last):
  File "/project/lgrandi/anaconda3/lib/python3.4/site-packages/pax-3.3.0-py3.4.egg/pax/plugin.py", line 41, in __del__
  File "/project/lgrandi/anaconda3/lib/python3.4/site-packages/pax-3.3.0-py3.4.egg/pax/plugins/io/Table.py", line 188, in shutdown
  File "/project/lgrandi/anaconda3/lib/python3.4/site-packages/pax-3.3.0-py3.4.egg/pax/plugins/io/Table.py", line 178, in _write_to_disk
  File "/project/lgrandi/anaconda3/lib/python3.4/site-packages/pax-3.3.0-py3.4.egg/pax/formats.py", line 238, in write_data
AttributeError: 'PyROOT_NoneType' object has no attribute 'Fill'