How to add this trigger ?

[Queuer]

Got a simple question (I hope), searched some SNMP threads but didnt find the answer to my problem...

I have a snmp trap, its working, I receive values then set it back to '' (two single quotes)

I want to add something like this:
When snmptrap is not '' -> TRIGGER ON -> SEND MAIL

The problem is the TRIGGER:
{myHost:snmptraps.str('')}=0
Its not working.

tried this too:
{myHost:snmptraps.last(0)}=''
but it fails, maybe I have to escape these single quotes... it wont let me add this trigger.

Any ideas on how to do that ?

Thx.

[zabbix_zen]

You've run into a real funny exception

Try excaping it as {myHost:snmptraps.str('''')}=0