OpenStreetMap's Nominatim indexing restarted after rank 29 to rank 0

I’m trying a new installation of OpenStreetMap’s Nominatim under Linux Debian on a small server that has 4 threads and sufficient space for full planet import.
I used the following command to resume indexing after rank 26 and when it came to end of rank 29,
it suddenly restarted to rank 0…

./utils/setup.php -v --index --create-functions --index-noanalyse --create-search-indices --osm2pgsql-cache 10000

Is it normal or did I make something wrong? Should I restart the import?