Both scripts barf badly if an exception occurs (e.g., a timeout) when scanning a single IP address using the --ip option. The reason is because while the check is surrounded by proper exception handling when scanning multiple IPs via the --file option, this exception handling is missing when scanning a single IP. Please add it; it's trivial.

if ip: # check_ip(ip) try: check_ip(ip) except Exception as e: with print_lock: print "[ERROR] [%s] - %s" % (ip, e)