Nmap_tracker error

 Logger: homeassistant.components.nmap_tracker
Source: components/nmap_tracker/__init__.py:275
Integration: Nmap Tracker (documentation, issues)
First occurred: 17:31:42 (4 occurrences)
Last logged: 18:25:43
Nmap scanning failed: "nmap: Target.cc:503: void Target::stopTimeOutClock(const timeval*): Assertion `htn.toclock_running == true' failed.\n"

Any idea where to look for whats causing this error ???
latest HA-core running on a Odroid XU4 SBC, ubuntu 20.04 (32 bit octal core ARM SBC)
Thanks