fatal error in the proccess of postresql backup

[Mikhail Pushkin]

Hi,

Could you please advise how to fix the problem:

Error: python-fd-mod: Could net get stat-info for file /var/lib/postgresql/11/main/base/346767/t28_26057727: "[Errno 2] No such file or directory: '/var/lib/postgresql/11/main/base/346767/t28_26057727'"

I'm using for backup python PostgreSQL Plugin.

Backup going for 30-60 min and after that failed with such error.