The earliest recollection of this bug is traced back to PAN-OS 8.1.14 - January 08, 2024.
This bug is fixed in PAN-OS versions 8.1.14.
Fixed a rare issue where a process ( pan_task ) restarted due to a NULL pointer exception.
For more information:
https://docs.paloaltonetworks.com/pan-os/8-1/pan-os-release-notes/pan-os-8-1-addressed-issues/pan-os-8-1-14-addressed-issues