Zigbee2mqtt running fine but log throwing many "assertion failed" errors. Troubleshooting assist please?

I just installed zigbee2mqtt yesterday running with the Sonoff wireless ZigBee bridge. Everything seems to be working fine but when I check the log I get quite a few of the “assertion failed” errors. Where else can I go to find information about this error. Forum and Google didn’t really turn up anything useful.

Zigbee2mqtt
[s6-init] making user provided files available at /var/run/s6/etc...exited 0.
[s6-init] ensuring user provided files have correct perms...exited 0.
[fix-attrs.d] applying ownership & permissions fixes...
[fix-attrs.d] done.
[cont-init.d] executing container initialization scripts...
[cont-init.d] socat.sh: executing... 
[19:04:12] INFO: Socat not enabled, marking service as down
[cont-init.d] socat.sh: exited 0.
[cont-init.d] zigbee2mqtt.sh: executing... 
[19:04:13] INFO: MQTT available, fetching server detail ...
[19:04:14] INFO: Previous config file found, checking backup
[19:04:14] INFO: Creating backup config in '/config/zigbee2mqtt/.configuration.yaml.bk'
[19:04:14] INFO: Adjusting Zigbee2mqtt core yaml config with add-on quirks ...
[cont-init.d] zigbee2mqtt.sh: exited 0.
[cont-init.d] done.
[services.d] starting services
[services.d] done.
[19:04:15] INFO: Handing over control to Zigbee2mqtt Core ...
> [email protected] start
> node index.js
Assertion failed
Assertion failed
Zigbee2MQTT:warn  2021-11-30 19:04:33: Using experimental new availability feature
Zigbee2MQTT:warn  2021-11-30 19:10:48: Device '0x00158d00035390ff' left the network
Assertion failed
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The only tip I got is to try upgrade EmberZNet NCP UART EZSP firmware Zigbee firmware version 6.7.9