diff --git a/alerting/src/main/kotlin/org/opensearch/alerting/resthandler/RestGetAlertsAction.kt b/alerting/src/main/kotlin/org/opensearch/alerting/resthandler/RestGetAlertsAction.kt
index cf83cec8c..aabcf8d6c 100644
--- a/alerting/src/main/kotlin/org/opensearch/alerting/resthandler/RestGetAlertsAction.kt
+++ b/alerting/src/main/kotlin/org/opensearch/alerting/resthandler/RestGetAlertsAction.kt
@@ -61,6 +61,8 @@ class RestGetAlertsAction : BaseRestHandler() {
         val workflowIds = mutableListOf<String>()
         if (workflowId.isNullOrEmpty() == false) {
             workflowIds.add(workflowId)
+        } else {
+            workflowIds.add("")
         }
         val table = Table(
             sortOrder,
diff --git a/alerting/src/main/kotlin/org/opensearch/alerting/transport/TransportGetAlertsAction.kt b/alerting/src/main/kotlin/org/opensearch/alerting/transport/TransportGetAlertsAction.kt
index 9308d8fb6..3d1beb13f 100644
--- a/alerting/src/main/kotlin/org/opensearch/alerting/transport/TransportGetAlertsAction.kt
+++ b/alerting/src/main/kotlin/org/opensearch/alerting/transport/TransportGetAlertsAction.kt
@@ -123,7 +123,9 @@ class TransportGetAlertsAction @Inject constructor(
             }
         } else if (getAlertsRequest.monitorIds.isNullOrEmpty() == false) {
             queryBuilder.filter(QueryBuilders.termsQuery("monitor_id", getAlertsRequest.monitorIds))
-            if (getAlertsRequest.workflowIds.isNullOrEmpty()) {
+            if (
+                getAlertsRequest.workflowIds != null && getAlertsRequest.workflowIds!!.size == 1 && getAlertsRequest.workflowIds!![0] == ""
+            ) {
                 val noWorkflowIdQuery = QueryBuilders.boolQuery()
                     .should(QueryBuilders.boolQuery().mustNot(QueryBuilders.existsQuery(Alert.WORKFLOW_ID_FIELD)))
                     .should(QueryBuilders.termsQuery(Alert.WORKFLOW_ID_FIELD, ""))