Steps to reproduce:

1. Create a trigger using function : find string V in ... 
2. The trigger will never be run because zabbix frontend can not update in database. The error output

    9146:20180801:141440.846 [Z3005] query failed: [1054] Unknown column 'function' in 'field list' [update triggers set expression='\{20010}=1' where triggerid=18300;
   update triggers set expression='\{44971}=1' where triggerid=41033;
   update functions set function='str',parameter='No' where functionid=20010;
   update functions set function='str',parameter='No' where functionid=44971;
   ] 

3. Checked the table function :  there is no column name : function.