diff --git a/src/datasource-zabbix/timeseries.ts b/src/datasource-zabbix/timeseries.ts
index 4d56250..3a77ee4 100644
--- a/src/datasource-zabbix/timeseries.ts
+++ b/src/datasource-zabbix/timeseries.ts
@@ -69,7 +69,7 @@ function downsample(datapoints, time_to, ms_interval, func) {
  * Detects interval between data points and aligns time series. If there's no value in the interval, puts null as a value.
  */
 export function align(datapoints: TimeSeriesPoints, interval?: number): TimeSeriesPoints {
-  if (interval) {
+  if (!interval) {
     interval = detectSeriesInterval(datapoints);
   }
 
diff --git a/src/datasource-zabbix/utils.ts b/src/datasource-zabbix/utils.ts
index 0b58123..9fd7c84 100644
--- a/src/datasource-zabbix/utils.ts
+++ b/src/datasource-zabbix/utils.ts
@@ -450,7 +450,7 @@ export function convertZabbixUnit(zabbixUnit: string): string {
 
 export function getValueMapping(item, valueMappings: any[]): ValueMapping[] | null {
   const { valuemapid } = item;
-  const mapping = valueMappings.find(m => m.valuemapid === valuemapid);
+  const mapping = valueMappings?.find(m => m.valuemapid === valuemapid);
   if (!mapping) {
     return null;
   }
diff --git a/src/datasource-zabbix/zabbix/connectors/zabbix_api/zabbixAPIConnector.ts b/src/datasource-zabbix/zabbix/connectors/zabbix_api/zabbixAPIConnector.ts
index cf1fef0..ae16863 100644
--- a/src/datasource-zabbix/zabbix/connectors/zabbix_api/zabbixAPIConnector.ts
+++ b/src/datasource-zabbix/zabbix/connectors/zabbix_api/zabbixAPIConnector.ts
@@ -204,11 +204,15 @@ export class ZabbixAPIConnector {
     const params = {
       itemids: itemids,
       output: [
-        'name', 'key_',
+        'name',
+        'key_',
         'value_type',
         'hostid',
         'status',
-        'state'
+        'state',
+        'units',
+        'valuemapid',
+        'delay'
       ],
       webitems: true,
       selectHosts: ['hostid', 'name']