i had a problem with my zabbix upgrade from 3.4.6 to 4.

it blocked on table events with this message :

110073:20181018:101346.219 [Z3005] query failed: [1034] Index for table 'events' is corrupt; try to repair it [alter table `events` add `name` varchar(2048) default '' not null]

After several problem i recreate the table events (empty). beforehand i disable the contraint check.

now i am blocked on

114299:20181018:170550.922 [Z3005] query failed: [1048] Column 'acknowledged' cannot be null [update problem set acknowledged=(select acknowledged from events where events.eventid=problem.eventid)]

normal i don't have any line in events.

How is it possible to pass this step ?

thx for your help.