Steps to reproduce:

1. Create host (host001) with at least one SNMP interface
2. Add discovery rule for that host
   • type: Zabbix trapper
   • key: disckey001
3. Add host prototype (hostprototype{#DISC}) for that discovery rule
4. Send discovery data and wait for the hosts to be discovered

   • bin/zabbix_sender -z localhost -p 10051 -s host001 -k disckey001 -o '{"data":[{"{#DISC}":"eth0"},{"{#DISC}":"eth1"}]}'

1. Remove SNMP interface from host001
2. Send discovery data again

   • bin/zabbix_sender -z localhost -p 10051 -s host001 -k disckey001 -o '{"data":[{"{#DISC}":"eth0"},{"{#DISC}":"eth1"}]}'

Result:
Server crash:

 22091:20200916:174347.879 In lld_hosts_save()
lld_host.c:2567:35: runtime error: member access within null pointer of type 'struct zbx_lld_interface_snmp_t'
 22091:20200916:174347.880 Got signal [signal:11(SIGSEGV),reason:1,refaddr:0x30]. Crashing ...