I encountered this problem when I was using it. How can I solve it?

[ChhR00]

Traceback (most recent call last):
File "CVE_2017_7921_EXP.py", line 150, in
fire.Fire(CVE_2017_7921_EXP)
File "/usr/local/lib/python3.8/dist-packages/fire/core.py", line 138, in Fire
component_trace = _Fire(component, args, parsed_flag_args, context, name)
File "/usr/local/lib/python3.8/dist-packages/fire/core.py", line 466, in _Fire
component, remaining_args = _CallAndUpdateTrace(
File "/usr/local/lib/python3.8/dist-packages/fire/core.py", line 675, in _CallAndUpdateTrace
component = fn(*varargs, **kwargs)
File "CVE_2017_7921_EXP.py", line 145, in run
exploit(self.targetList)
File "CVE_2017_7921_EXP.py", line 84, in exploit
result_list[_index[-1]] + ',' + result_list[_index[-1] + 1]
IndexError: list index out of range