TypeError: argument of type 'NoneType' is not iterable

[Techno-Fox]

This error appears when trying to fuzz stdin on a program (not arguments, just stdin). However manul forces the @@ which is for arguments.

Error :

Traceback (most recent call last):
File "/usr/lib/python3.7/multiprocessing/process.py", line 297, in _bootstrap
self.run()
File "/usr/lib/python3.7/multiprocessing/process.py", line 99, in run
self._target(*self._args, **self._kwargs)
File "./manul.py", line 993, in run_fuzzer_instance
fuzzer_instance.run() # never return
File "./manul.py", line 851, in run
self.dry_run()
File "./manul.py", line 613, in dry_run
if "is for the wrong architecture" in err_output:
TypeError: argument of type 'NoneType' is not iterable

P.S. Thank you for taking time to read this issue, and hopefully fix it.