pgbackrest: ERROR: [029]: unable to convert base 10 string '0000000B' to unsigned int

Hi,

We are using pgbackrest (2.21) to backup out postgresql (11) clusters.
Last night our nightly diff backup gave me the
ERROR: unable to convert base 10 string '0000000B' to unsigned int.
I tried if a full backup would fix this, but it didn't.

Luckily this was only on our development/test cluster, so it is not a real
problem, but what is going on here and what would be the best way to fix this?

The last few lines of the log (with --log-level-console=info) are:

2020-01-21 08:07:44.613 P02 INFO: backup file
ericv.dev.xs4all.net:/var/lib/postgresql/11/main/pg_xact/0000 (136KB, 100%)
checksum 76e273a0f888d449a540f86eacd0bb8386c49209
2020-01-21 08:07:44.614 P00 INFO: full backup size = 62.7MB
2020-01-21 08:07:44.615 P00 INFO: execute non-exclusive pg_stop_backup() and
wait for all WAL segments to archive
2020-01-21 08:07:44.917 P00 INFO: backup stop archive =
0000000B00000015000000C3, lsn = 15/C3002F38
ERROR: [029]: unable to convert base 10 string '0000000B' to unsigned int
2020-01-21 08:07:45.448 P00 INFO: backup command end: aborted with exception [029]

Eric Veldhuyzen