Error on certain hash input

[bee-san]

sth -t "E4F070309AC20334B70C5EA9268CE4FC6438202D"
Traceback (most recent call last):
  File "c:\users\redacted\miniconda3\lib\runpy.py", line 194, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "c:\users\redacted\miniconda3\lib\runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "C:\Users\redacted\miniconda3\Scripts\sth.exe\__main__.py", line 7, in <module>
  File "c:\users\redacted\miniconda3\lib\site-packages\click\core.py", line 829, in __call__
    return self.main(*args, **kwargs)
  File "c:\users\redacted\miniconda3\lib\site-packages\click\core.py", line 782, in main
    rv = self.invoke(ctx)
  File "c:\users\redacted\miniconda3\lib\site-packages\click\core.py", line 1066, in invoke
    return ctx.invoke(self.callback, **ctx.params)
  File "c:\users\redacted\miniconda3\lib\site-packages\click\core.py", line 610, in invoke
    return callback(*args, **kwargs)
  File "c:\users\redacted\miniconda3\lib\site-packages\search_that_hash\__main__.py", line 83, in main
    cracking_handler.start()
  File "c:\users\redacted\miniconda3\lib\site-packages\search_that_hash\cracker\handler.py", line 31, in start
    return self.fast.fast_crack()
  File "c:\users\redacted\miniconda3\lib\site-packages\search_that_hash\cracker\fast_mode_mod\runner.py", line 24, in fast_crack
    self.results.extend(results)
TypeError: 'NoneType' object is not iterable```