diff --git a/application/src/main/java/run/halo/app/content/impl/PostServiceImpl.java b/application/src/main/java/run/halo/app/content/impl/PostServiceImpl.java
index 86ff03228..1a94cdd60 100644
--- a/application/src/main/java/run/halo/app/content/impl/PostServiceImpl.java
+++ b/application/src/main/java/run/halo/app/content/impl/PostServiceImpl.java
@@ -170,7 +170,7 @@ public class PostServiceImpl extends AbstractContentService implements PostServi
             return Flux.empty();
         }
         return Flux.fromIterable(usernames)
-            .flatMap(userService::getUserOrGhost)
+            .concatMap(userService::getUserOrGhost)
             .map(user -> {
                 Contributor contributor = new Contributor();
                 contributor.setName(user.getMetadata().getName());