[Fix] Add more guards for IP address

src/plugins/lua/once_received.lua

@@ -77,7 +77,7 @@ local function check_quantity_received (task)
   local hn = task:get_hostname()
 
   -- Here we don't care about received
-  if (not hn or hn == 'unknown') and task_ip then
+  if (not hn or hn == 'unknown') and task_ip and task_ip:is_valid() then
     task:get_resolver():resolve_ptr({task = task,
       name = task_ip:to_string(),
       callback = recv_dns_cb