diff --git a/publisher/src/LeanPipe/LeanPipeSubscriber.cs b/publisher/src/LeanPipe/LeanPipeSubscriber.cs
index 9e4443e..7f0d314 100644
--- a/publisher/src/LeanPipe/LeanPipeSubscriber.cs
+++ b/publisher/src/LeanPipe/LeanPipeSubscriber.cs
@@ -80,7 +80,7 @@ private async Task ExecuteAsync(SubscriptionEnvelope envelope, OperationType typ
         {
             await NotifyResultAsync(envelope.Id, SubscriptionStatus.Malformed, type);
             throw new InvalidOperationException(
-                $"Cannot deserialize topic {envelope.Topic} of type {envelope.TopicType}.",
+                $"Cannot deserialize topic {envelope.Topic.RootElement.GetRawText()} of type {envelope.TopicType}.",
                 e
             );
         }