diff --git a/apm-collector/apm-collector-ui/collector-ui-jetty-provider/src/main/java/org/apache/skywalking/apm/collector/ui/jetty/handler/GraphQLHandler.java b/apm-collector/apm-collector-ui/collector-ui-jetty-provider/src/main/java/org/apache/skywalking/apm/collector/ui/jetty/handler/GraphQLHandler.java
index 18799e375..c66a5052c 100644
--- a/apm-collector/apm-collector-ui/collector-ui-jetty-provider/src/main/java/org/apache/skywalking/apm/collector/ui/jetty/handler/GraphQLHandler.java
+++ b/apm-collector/apm-collector-ui/collector-ui-jetty-provider/src/main/java/org/apache/skywalking/apm/collector/ui/jetty/handler/GraphQLHandler.java
@@ -118,7 +118,7 @@ public class GraphQLHandler extends JettyHandler {
 
             JsonObject jsonObject = new JsonObject();
             if (data != null) {
-                jsonObject.addProperty(DATA, data.toString());
+                jsonObject.add(DATA, gson.fromJson(gson.toJson(data), JsonObject.class));
             }
 
             if (CollectionUtils.isNotEmpty(errors)) {