pg dump – LOCK TABLE public.schema_migrations IN ACCESS SHARE MODE when executing pg_dump

I have a cron job that execute a backup on all databases on the sever. The pg_dump gets stuck in one database/table. Tracking the issue on pg_status_activity table I got:

Message:

LOCK TABLE public.table_name IN ACCESS SHARE MODE

No errors on PG logs were found

Server OS: Linux CentOS 7
Database : PostgresSQL 12

Thanks