diff --git a/api4/post.go b/api4/post.go
index 479d249967..8892bee66d 100644
--- a/api4/post.go
+++ b/api4/post.go
@@ -587,6 +587,17 @@ func getPostThread(c *Context, w http.ResponseWriter, r *http.Request) {
 		c.Err = err
 		return
 	}
+	if list.FirstInaccessiblePostTime != 0 {
+		// e.g. if root post is archived in a cloud plan,
+		// we don't want to display the thread,
+		// but at the same time the request was not bad,
+		// so we return the time of archival and let the client
+		// show an error
+		if err := (&model.PostList{Order: []string{}, FirstInaccessiblePostTime: list.FirstInaccessiblePostTime}).EncodeJSON(w); err != nil {
+			c.Logger.Warn("Error while writing response", mlog.Err(err))
+		}
+		return
+	}
 
 	post, ok := list.Posts[c.Params.PostId]
 	if !ok {