Steps to reproduce:

1. Create automatic registration, automatic template association

1. The client sends metadata

1. zabbix-server.log  report an error

Result:
183775:20180911:142900.495 [Z3005] query failed: [1064] You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1 [select t.triggerid,t.templateid from triggers t,functions f,items i where t.triggerid=f.triggerid and f.itemid=i.itemid and i.hostid=10315 and]
183775:20180911:142900.496 cannot send list of active checks to "172.16.66.55": host [172.16.66.55] not found