It was already resolved in ZBXNEXT-485. You probably use older trunk database from pre-1.9.7.
Remove everything from table help_items and insert required records from data.sql for this table only. It should help.
Why wasn't there incremental database patches for this? I understand things like templates not getting patched, but help_items are a core part of the system and I would have thought should be updated.
Maybe the data.sql needs to be seperated into different parts?
> Why wasn't there incremental database patches for this?
Yes, this change has been not performed in the http://www.zabbix.org/svn/zabbixorg/zabbix/upgrade_incremental/dbpatches_inc/22246.dbpatch.sql
Source: http://zabbix.org/wiki/How_to/trunk_db_patches
Quote: "This is a community maintained attempt at providing incremental database patches."
> Maybe the data.sql needs to be seperated into different parts?
See and vote for ZBXNEXT-554
Thanks for the explanation. 
I did forget the incremental database patches were community maintained. Thanks for all your efforts
ok, missing part in the incremental patch has been added. if you have already patched past that revision, it should be safe to re-apply that patch (it did seem to work for me )
something like :
mysql zabbix_1_9 < 22246.dbpatch.sql