Update 3.2.6 > 3.2.11

[mgnhost]

Hello,

After the upgrade zabbix-server 3.2.6 > 3.2.11, it stopped running in error logs:

 4028:20180115:184119.204 current database version (mandatory/optional): 03010047/03010047
  4028:20180115:184119.204 required mandatory version: 03020000
  4028:20180115:184119.204 optional patches were found
  4028:20180115:184119.204 starting automatic database upgrade
  4028:20180115:184119.247 [Z3005] query failed: [1005] Can't create table 'zabbix.#sql-d95_1b6' (errno: 121) [alter table event_recovery add constraint c_event_recovery_3 foreign key (c_eventid) references events (eventid) on delete cascade]
  4028:20180115:184119.247 database upgrade failed

How to fix it?

P.S. MySQL 5.5

[mgnhost]

Problem solved.