# Error from Chat SDK when calling "buildFromSerializedData" on a message with reactions

**URL:** <https://community.sendbird.com/t/error-from-chat-sdk-when-calling-buildfromserializeddata-on-a-message-with-reactions/1194>\
**Category:** Sendbird Chat API/SDK\
**Tags:** group-channel, chatsdk\
**Created:** [October 27, 2020, 3:08pm UTC](https://community.sendbird.com/t/error-from-chat-sdk-when-calling-buildfromserializeddata-on-a-message-with-reactions/1194 "2020-10-27T15:08:51Z")\
**Posts on this page:** 1\
**Showing post:** 14

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**Author:** ![SamKK](https://avatars.discourse-cdn.com/v4/letter/s/49beb7/32.png) [@SamKK](https://community.sendbird.com/u/SamKK)\
**Post date:** [October 27, 2020, 4:56pm UTC](https://community.sendbird.com/t/error-from-chat-sdk-when-calling-buildfromserializeddata-on-a-message-with-reactions/1194/14 "2020-10-27T16:56:53Z")

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I would appreciate that

There was these issues in this thread  
We also had some weird scenario where unless we got two versions matching by incrementing the version number on each package, they would not communicate correctly and all sorts of random errors were being thrown  
We also ideally needed a way to attach some additional data to be stored in indexdb, without having to save the data on the “data” object of a channel/message

Ultimately we couldn’t find a way and built our own solution that worked really well up until we decided to implement Reactions

> [@SendBird Sync Manager issues](https://community.sendbird.com/t/sendbird-sync-manager-issues/870):
>
> I’m not sure if it’s something wrong with my implementation or an actual error with the package. Everything else except these two cases work perfectly. When I add a user to a channel, SendBird SyncManager throws this error: SendBirdSyncManager.min.js?6534:6 Uncaught TypeError: Cannot read property ‘userId’ of null at eval (SendBirdSyncManager.min.js?6534:6) at eval (SendBirdSyncManager.min.js?6534:6) at IDBRequest.e.onsuccess (SendBirdSyncManager.min.js?6534:6) When I delete a message from…

I also just found that I can do this to send a typing notification; Any hints or anything against me using this?

```
let ch = new sendbird.GroupChannel();
ch.url = 'bf7ea026-6379-4642-b5c8-633e9eb6d661';
ch.startTyping();

```

It seems to send a socket event, but I can’t test if i can receive it at the moment

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