not scan

[Kalimon12]

Traceback (most recent call last):
File "/home/xubuntu/tools/badKarma/core/main.py", line 544, in run_multi_extra
view, pid, id = self.engine.start_task(ext.name, sub_item, address, rport=port, proto=protocol, service_str=service, karmaconf={"autoexec":self.main.auto_exec.get_active(), "proxychains":self.main.use_proxychains.get_active()})
File "/home/xubuntu/tools/badKarma/core/extensions.py", line 209, in start_task
out, pid = ext.task( ext_conf ) # get output and task pid
File "/home/xubuntu/tools/badKarma/extensions/generic/shell.py", line 56, in task
cmd = cmd.replace('$domain', config["domain"])
TypeError: replace() argument 2 must be str, not None