xbkaishui commented on a change in pull request #5412:
URL: https://github.com/apache/skywalking/pull/5412#discussion_r479702699



##########
File path: 
apm-sniffer/apm-sdk-plugin/rocketMQ-4.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/rocketMQ/v4/OnExceptionInterceptor.java
##########
@@ -34,15 +34,22 @@
 public class OnExceptionInterceptor implements 
InstanceMethodsAroundInterceptor {
 
     public static final String CALLBACK_OPERATION_NAME_PREFIX = "RocketMQ/";
+    private static final String DEFAULT_TOPIC = "no_topic";
 
     @Override
     public void beforeMethod(EnhancedInstance objInst, Method method, Object[] 
allArguments, Class<?>[] argumentsTypes,
         MethodInterceptResult result) throws Throwable {
         SendCallBackEnhanceInfo enhanceInfo = (SendCallBackEnhanceInfo) 
objInst.getSkyWalkingDynamicField();
-        AbstractSpan activeSpan = 
ContextManager.createLocalSpan(CALLBACK_OPERATION_NAME_PREFIX + 
enhanceInfo.getTopicId() + "/Producer/Callback");
+        String topicId = DEFAULT_TOPIC;
+        if (enhanceInfo != null) {

Review comment:
       done




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