diff --git a/src/main/java/run/halo/app/service/PostMetaService.java b/src/main/java/run/halo/app/service/PostMetaService.java
index c66607db0..00a4c0440 100644
--- a/src/main/java/run/halo/app/service/PostMetaService.java
+++ b/src/main/java/run/halo/app/service/PostMetaService.java
@@ -26,7 +26,7 @@ public interface PostMetaService extends BaseMetaService<PostMeta> {
      * @param postMetas post metas must not be null
      * @return a list of post meta
      */
-    List<PostMeta> createOrUpdateByPostId(@NonNull Integer postId, @NonNull Set<PostMeta> postMetas);
+    List<PostMeta> createOrUpdateByPostId(@NonNull Integer postId, Set<PostMeta> postMetas);
 
     /**
      * Lists post metas by post id.
diff --git a/src/main/java/run/halo/app/service/impl/PostMetaServiceImpl.java b/src/main/java/run/halo/app/service/impl/PostMetaServiceImpl.java
index 7480f2c1b..4c0f2bd7a 100644
--- a/src/main/java/run/halo/app/service/impl/PostMetaServiceImpl.java
+++ b/src/main/java/run/halo/app/service/impl/PostMetaServiceImpl.java
@@ -47,7 +47,6 @@ public class PostMetaServiceImpl extends BaseMetaServiceImpl<PostMeta> implement
     @Override
     public List<PostMeta> createOrUpdateByPostId(Integer postId, Set<PostMeta> postMetas) {
         Assert.notNull(postId, "Post id must not be null");
-        Assert.notNull(postMetas, "Post metas must not be null");
         if (CollectionUtils.isEmpty(postMetas)) {
             return Collections.emptyList();
         }