diff --git a/x-pack/plugin/ent-search/src/test/java/org/elasticsearch/xpack/application/connector/syncjob/action/UpdateConnectorSyncJobIngestionStatsActionRequestTests.java b/x-pack/plugin/ent-search/src/test/java/org/elasticsearch/xpack/application/connector/syncjob/action/UpdateConnectorSyncJobIngestionStatsActionRequestTests.java
index 48ab14558db7e..4f78ad3ffa7e7 100644
--- a/x-pack/plugin/ent-search/src/test/java/org/elasticsearch/xpack/application/connector/syncjob/action/UpdateConnectorSyncJobIngestionStatsActionRequestTests.java
+++ b/x-pack/plugin/ent-search/src/test/java/org/elasticsearch/xpack/application/connector/syncjob/action/UpdateConnectorSyncJobIngestionStatsActionRequestTests.java
@@ -47,6 +47,21 @@ public void testValidate_WhenConnectorSyncJobIdIsEmpty_ExpectValidationError() {
         assertThat(exception.getMessage(), containsString(EMPTY_CONNECTOR_SYNC_JOB_ID_ERROR_MESSAGE));
     }
 
+    public void testValidate_WhenConnectorSyncJobIdIsNull_ExpectValidationError() {
+        UpdateConnectorSyncJobIngestionStatsAction.Request request = new UpdateConnectorSyncJobIngestionStatsAction.Request(
+            null,
+            0L,
+            0L,
+            0L,
+            0L,
+            Instant.now()
+        );
+        ActionRequestValidationException exception = request.validate();
+
+        assertThat(exception, notNullValue());
+        assertThat(exception.getMessage(), containsString(EMPTY_CONNECTOR_SYNC_JOB_ID_ERROR_MESSAGE));
+    }
+
     public void testValidate_WhenDeletedDocumentCountIsNegative_ExpectValidationError() {
         UpdateConnectorSyncJobIngestionStatsAction.Request request = new UpdateConnectorSyncJobIngestionStatsAction.Request(
             randomAlphaOfLength(10),