diff --git a/docs/en/changes/changes.md b/docs/en/changes/changes.md
index b87b92c8bd..391424959d 100644
--- a/docs/en/changes/changes.md
+++ b/docs/en/changes/changes.md
@@ -49,6 +49,7 @@
 * Bump up graphql-java to 21.0.
 * Apply MQE on Virtual-Cache layer UI-templates
 * Add Echo component ID(5015) language: Golang.
+* Fix `index out of bounds exception` in `aggregate_labels` MQE function.
 
 #### UI
 
diff --git a/oap-server/server-query-plugin/query-graphql-plugin/src/main/java/org/apache/skywalking/oap/query/graphql/mqe/rt/operation/AggregateLabelsOp.java b/oap-server/server-query-plugin/query-graphql-plugin/src/main/java/org/apache/skywalking/oap/query/graphql/mqe/rt/operation/AggregateLabelsOp.java
index 759f2ba8ad..617894eb71 100644
--- a/oap-server/server-query-plugin/query-graphql-plugin/src/main/java/org/apache/skywalking/oap/query/graphql/mqe/rt/operation/AggregateLabelsOp.java
+++ b/oap-server/server-query-plugin/query-graphql-plugin/src/main/java/org/apache/skywalking/oap/query/graphql/mqe/rt/operation/AggregateLabelsOp.java
@@ -32,6 +32,7 @@ import org.apache.skywalking.oap.query.graphql.type.mql.ExpressionResult;
 import org.apache.skywalking.oap.query.graphql.type.mql.MQEValue;
 import org.apache.skywalking.oap.query.graphql.type.mql.MQEValues;
 import org.apache.skywalking.oap.query.graphql.type.mql.Metadata;
+import org.apache.skywalking.oap.server.library.util.CollectionUtils;
 
 public class AggregateLabelsOp {
 
@@ -54,6 +55,9 @@ public class AggregateLabelsOp {
     private static ExpressionResult aggregateLabeledValueResult(ExpressionResult expResult,
                                                                 AggregateLabelsFuncFactory factory) {
         List<MQEValues> results = expResult.getResults();
+        if (CollectionUtils.isEmpty(results)) {
+            return expResult;
+        }
 
         List<MQEValue> combineTo = results.get(0).getValues();
         for (int i = 0; i < combineTo.size(); i++) {