Tvheadend

1) Tvheadend sat>ip client on QNAP NAS
2) Tvheadend sat>ip server on Rpi3b+ 4.3-1282~g1c2a21399 with DVB-T tuner
3) various other sat>ip servers on other Rpi2s with DVB-T and DVB-S tuners

When I launch a DVB-T network force scan from the Tvheadend sat>ip client on the QNAP, the Tvheadend installation (2) on the Rpi3b+ immediately crashes:

Jun 20 17:57:19 openHABianPi tvheadend[18209]: mpegts: 626MHz in DVB-T Network - tuning on DiBcom 7000PC #1 : DVB-T #0
Jun 20 17:57:19 openHABianPi tvheadend[18209]: subscription: 0002: "SAT>IP" subscribing to mux "626MHz", weight: 6, adapter: "DiBcom 7000PC #1 : DVB-T #0", network: "DVB-T Network", service: "Raw PID Subscription", hostname="192.168.1.32" 
Jun 20 17:57:20 openHABianPi tvheadend[18209]: linuxdvb: Unhandled ERROR_BLOCK_COUNT scale: 0
Jun 20 17:57:24 openHABianPi systemd[1]: tvheadend.service: Main process exited, code=killed, status=6/ABRT
Jun 20 17:57:24 openHABianPi systemd[1]: tvheadend.service: Unit entered failed state.
Jun 20 17:57:24 openHABianPi systemd[1]: tvheadend.service: Failed with result 'signal'.

All other installations work OK. Force scan launched directly from the web interface of the Rpi3b+ works OK.
The main difference with the Rpi3b+ may be that both LAN and WiFi are enabled, but Tvheadend appears to respond to the SAT>IP client on the NAS from the LAN IP address.