git subrepo push --remote=git@github.com:sw1136562366/holoinsight.git…

… --branch=fix/fix_apm_log_level opensource

subrepo:
  subdir:   "opensource"
  merged:   "4fd27c37b"
upstream:
  origin:   "git@github.com:sw1136562366/holoinsight.git"
  branch:   "fix/fix_apm_log_level"
  commit:   "4fd27c37b"
git-subrepo:
  version:  "0.4.3"
  origin:   "https://github.com/Homebrew/brew"
  commit:   "4446fe603"

server/apm/apm-server/apm-receiver/src/main/java/io/holoinsight/server/apm/receiver/trace/SpanHandler.java

@@ -180,7 +180,9 @@ public void buildRelation(List<RPCTrafficSourceBuilder> relationBuilders) throws
 
     relationBuilders.forEach(callingIn -> {
       ServiceRelation serviceRelation = callingIn.toServiceRelation();
-      serverRelationList.add(ServiceRelationDO.fromServiceRelation(serviceRelation));
+      if (serviceRelation != null) {
+        serverRelationList.add(ServiceRelationDO.fromServiceRelation(serviceRelation));
+      }
 
       ServiceInstanceRelation serviceInstanceRelation = callingIn.toServiceInstanceRelation();
       if (serviceInstanceRelation != null) {