Hi Team,

We have upgraded our Zabbix version from 3.4.9 to 4.0.1. The database upgrade is failed due

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to below error. Kindly help us to fix the same.

53733:20181209:091945.404 [Z3005] query failed: [0] PGRES_FATAL_ERROR:ERROR:  null value in column "acknowledged" violates not-null constraint
DETAIL:  Failing row contains (1960149, 0, 0, 19390, 1544346137, 533435023, 1960162, 1544346557, 780437891, null, 0, , null, 0).
 [update problem set acknowledged=(select acknowledged from events where events.eventid=problem.eventid)]
 53733:20181209:091945.405 database upgrade failed

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Best regards,

Md. Mansoor