diff --git a/src/datasource-zabbix/zabbix/connectors/zabbix_api/zabbixAPIConnector.ts b/src/datasource-zabbix/zabbix/connectors/zabbix_api/zabbixAPIConnector.ts
index 39905e2..1a67b46 100644
--- a/src/datasource-zabbix/zabbix/connectors/zabbix_api/zabbixAPIConnector.ts
+++ b/src/datasource-zabbix/zabbix/connectors/zabbix_api/zabbixAPIConnector.ts
@@ -114,7 +114,7 @@ export class ZabbixAPIConnector {
       action: action
     };
 
-    if (severity) {
+    if (severity !== undefined) {
       params.severity = severity;
     }