avoid messaged if zabbix-server was down?

[Dickie]

In my zabbix-configuration I check if I get data from the zabbix-agent:
item: proc.num[zabbix_agentd]
trigger: {SERVERroc.num[zabbix_agentd].nodata(300)}=1

If a host is not available, trigger switches on and I get a message with some repeats.

But if the zabbix-server is down and I restart him, zabbix sends this message for all servers and the repeats are sent even though the trigger changed his status.

Does anyone know a way to avoid this?

Thanks