"Airspeed sensor failure detected (1, -1)" after landing

[zimmy87]

When running the PX4 JSBSim bridge via make px4_sitl jsbsim on Ubuntu 18.04 and with QGroundControl connected, I'm seeing the PX4 console output a poll timeout 0, 22 error after completing a mission and landing, as well as a Airspeed sensor failure detected (1, -1) dialog inside QGroundControl. The view inside of FlightGear goes black and PX4 is unresponsive at this point and needs a restart before uploading another mission.