diff --git a/apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/context/trace/Span.java b/apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/context/trace/Span.java
index 28f32f6ac..f3a3faa0e 100644
--- a/apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/context/trace/Span.java
+++ b/apm-sniffer/apm-agent-core/src/main/java/org/skywalking/apm/agent/core/context/trace/Span.java
@@ -383,7 +383,7 @@ public class Span implements AbstractSpan {
                 }
             }
             if (span.tagsWithInt != null) {
-                if (tagWithInt != null) {
+                if (tagWithInt == null) {
                     tagWithInt = new JsonObject();
                 }
                 for (IntTagItem item : span.tagsWithInt) {
diff --git a/docker-compose.yml b/docker-compose.yml
index c0164684b..0f07a2151 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -30,6 +30,9 @@ services:
   es-server:
     image: elasticsearch:5.3
     command: "-Enode.name=TestNode -Enetwork.host=0.0.0.0 -Ehttp.cors.enabled=true -Ehttp.cors.allow-origin=* -Ethread_pool.bulk.queue_size=1000 -Ecluster.name=CollectorDBCluster"
+    environment:
+      - bootstrap.memory_lock=true
+      - "ES_JAVA_OPTS=-Xms512m -Xmx512m"
     expose:
       - "9200"
       - "9300"