TypeError: 'NoneType' object is not subscriptable in M1 with Python3.9 installed from Homebrew

[mochadwi]

Traceback (most recent call last):
  File "/usr/local/bin/rex", line 33, in <module>
    sys.exit(load_entry_point('release-exporter==1.1.1', 'console_scripts', 'rex')())
  File "/usr/local/lib/python3.9/site-packages/release_exporter-1.1.1-py3.9.egg/release_exporter/cli.py", line 144, in main
  File "/usr/local/lib/python3.9/site-packages/click-8.1.7-py3.9.egg/click/core.py", line 1157, in __call__
    return self.main(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/click-8.1.7-py3.9.egg/click/core.py", line 1078, in main
    rv = self.invoke(ctx)
  File "/usr/local/lib/python3.9/site-packages/click-8.1.7-py3.9.egg/click/core.py", line 1688, in invoke
    return _process_result(sub_ctx.command.invoke(sub_ctx))
  File "/usr/local/lib/python3.9/site-packages/click-8.1.7-py3.9.egg/click/core.py", line 1434, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "/usr/local/lib/python3.9/site-packages/click-8.1.7-py3.9.egg/click/core.py", line 783, in invoke
    return __callback(*args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/click-8.1.7-py3.9.egg/click/decorators.py", line 33, in new_func
    return f(get_current_context(), *args, **kwargs)
  File "/usr/local/lib/python3.9/site-packages/release_exporter-1.1.1-py3.9.egg/release_exporter/cli.py", line 58, in markdown
  File "/usr/local/lib/python3.9/site-packages/release_exporter-1.1.1-py3.9.egg/release_exporter/formatter.py", line 26, in write
    
  File "/usr/local/lib/python3.9/site-packages/release_exporter-1.1.1-py3.9.egg/release_exporter/formatter.py", line 50, in _converter
    def add_literal_data(self, data): pass
TypeError: 'NoneType' object is not subscriptable