diff -Nur -x '*.orig' -x '*.rej' zabbix-3.4.9/frontends/php/include/classes/api/services/CItemGeneral.php mezzanine_patched_zabbix-3.4.9/frontends/php/include/classes/api/services/CItemGeneral.php
--- zabbix-3.4.9/frontends/php/include/classes/api/services/CItemGeneral.php    2018-05-09 11:57:42.000000000 +0200
+++ mezzanine_patched_zabbix-3.4.9/frontends/php/include/classes/api/services/CItemGeneral.php  2018-05-29 11:25:39.130154434 +0200
@@ -1630,7 +1630,7 @@
                $master_itemids = [];

                foreach ($items as $item) {
-                       if ($item['type'] == ITEM_TYPE_DEPENDENT) {
+                       if ($item['type'] == ITEM_TYPE_DEPENDENT && array_key_exists('master_itemid', $item)) {
                                $master_itemids[$item['master_itemid']] = true;
                        }
                }
@@ -1645,7 +1645,7 @@   
                        $host_master_items = [];

                        foreach ($items as $item) {
-                               if ($item['type'] != ITEM_TYPE_DEPENDENT) {
+                               if ($item['type'] == ITEM_TYPE_DEPENDENT && array_key_exists('master_itemid', $item)) {
                                        continue;
                                }
                                $master_item = $master_items[$item['master_itemid']];
@@ -1653,7 +1653,7 @@
                                if (!array_key_exists($item['hostid'], $host_master_items)) {
                                        $host_master_items[$item['hostid']] = [];
                                }
-                               if ($master_item['hostid'] != $item['hostid']) {
+                               if (bccomp($master_item['hostid'], $item['hostid']) != 0) {
                                        if (!array_key_exists($master_item['key_'], $host_master_items[$item['hostid']])) {
                                                $inherited_master_items = DB::select('items', [
                                                        'output' => ['itemid'],