Can't upgrade PostgreSQL database (3.4 to 4.0)

[NovaSatori]

Hi, everyone!
Trying to upgrade zabbix 3.4 to 4.0, get an error
"query failed: [0] PGRES_FATAL_ERROR:ERROR: relation "groups_1" does not exist"
If it matters, the database was migrated earlier from MySQL to PostgreSQL and worked fine. Any ideas?

[NovaSatori]

Ok, I manually created indexes for some tables. Not sure if it'is the right way to go, but at least database upgrade script has ended its job without errors.

CREATE INDEX groups_1 ON groups (groupid);
CREATE INDEX autoreg_host_1 ON autoreg_host (proxy_hostid,host);
CREATE INDEX problem_tag_1 ON problem_tag (eventid,tag,value);
CREATE INDEX problem_tag_2 ON problem_tag (eventid,tag,value);
CREATE INDEX escalations_1 ON escalations (actionid, triggerid,itemid,escalationid);