KeyError in entity_reference

[atcuno]

Traceback (most recent call last):
  File "/usr/local/bin/evtx_dump.py", line 4, in <module>
    __import__('pkg_resources').run_script('python-evtx==0.6.1', 'evtx_dump.py')
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 739, in run_script
    self.require(requires)[0].run_script(script_name, ns)
  File "/usr/lib/python2.7/dist-packages/pkg_resources/__init__.py", line 1501, in run_script
    exec(script_code, namespace, namespace)
  File "/usr/local/lib/python2.7/dist-packages/python_evtx-0.6.1-py2.7.egg/EGG-INFO/scripts/evtx_dump.py", line 42, in <module>
    
  File "/usr/local/lib/python2.7/dist-packages/python_evtx-0.6.1-py2.7.egg/EGG-INFO/scripts/evtx_dump.py", line 37, in main
    
  File "build/bdist.linux-x86_64/egg/Evtx/Evtx.py", line 498, in xml
  File "build/bdist.linux-x86_64/egg/Evtx/Views.py", line 204, in evtx_record_xml_view
  File "build/bdist.linux-x86_64/egg/Evtx/Views.py", line 191, in render_root_node
  File "build/bdist.linux-x86_64/egg/Evtx/Views.py", line 176, in render_root_node_with_subs
  File "build/bdist.linux-x86_64/egg/Evtx/Views.py", line 126, in rec
  File "build/bdist.linux-x86_64/egg/Evtx/Views.py", line 166, in rec
  File "build/bdist.linux-x86_64/egg/Evtx/Views.py", line 191, in render_root_node
  File "build/bdist.linux-x86_64/egg/Evtx/Views.py", line 176, in render_root_node_with_subs
  File "build/bdist.linux-x86_64/egg/Evtx/Views.py", line 146, in rec
  File "build/bdist.linux-x86_64/egg/Evtx/Nodes.py", line 668, in entity_reference
KeyError: 20