# Crash when disconnecting from a channel **URL:** \ **Category:** Android\ **Tags:** android, uikit\ **Created:** [March 25, 2022, 2:12pm UTC](https://community.sendbird.com/t/crash-when-disconnecting-from-a-channel/4267 "2022-03-25T14:12:56Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![jack](https://avatars.discourse-cdn.com/v4/letter/j/cc9497/32.png) [@jack](https://community.sendbird.com/u/jack)\ **Post date:** [March 25, 2022, 2:12pm UTC](https://community.sendbird.com/t/crash-when-disconnecting-from-a-channel/4267/1 "2022-03-25T14:12:56Z")
- OS: Android - UIKit version: 2.2.4 I’m implementing disconnection in ChannelList and Channel like below: ```auto override fun onPause() { super.onPause() SendBirdUIKit.disconnect { } } override fun onResume() { super.onResume() SendBirdUIKit.connect { } } ``` It works in ChannelList while it crash the app when disconnecting from a channel. The exception is included like below: ```auto java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.sendbird.android.User.getUserId()' on a null object reference at com.sendbird.uikit.utils.ChannelUtils.makeProfileUrlsFromChannel(ChannelUtils.java:115) at com.sendbird.uikit.utils.ChannelUtils.loadChannelCover(ChannelUtils.java:103) at com.sendbird.uikit.widgets.ChannelPreview.drawChannel(ChannelPreview.java:102) ``` What is the best practice to disconnect from a channel? Thanks! ---
**Author:** ![Doo\_Rim](https://sea2.discourse-cdn.com/flex020/user_avatar/community.sendbird.com/doo_rim/32/239_2.png) [@Doo\_Rim](https://community.sendbird.com/u/Doo_Rim)\ **Post date:** [March 27, 2022, 11:28pm UTC](https://community.sendbird.com/t/crash-when-disconnecting-from-a-channel/4267/2 "2022-03-27T23:28:49Z")
Hi, @jack Did you implement `SendBirdUIKit.init()`? ---
**Author:** ![jack](https://avatars.discourse-cdn.com/v4/letter/j/cc9497/32.png) [@jack](https://community.sendbird.com/u/jack)\ **Post date:** [March 28, 2022, 1:51am UTC](https://community.sendbird.com/t/crash-when-disconnecting-from-a-channel/4267/3 "2022-03-28T01:51:50Z")
Hi @Doo_Rim , Thanks for the reply. I called `SendBirdUIKit.init()` in the class which extends `Application`. ---
**Author:** ![jack](https://avatars.discourse-cdn.com/v4/letter/j/cc9497/32.png) [@jack](https://community.sendbird.com/u/jack)\ **Post date:** [March 28, 2022, 6:47am UTC](https://community.sendbird.com/t/crash-when-disconnecting-from-a-channel/4267/4 "2022-03-28T06:47:55Z")
I’ve also tried to call `init()` before `connect()` instead of calling it once in `BaseApplication` class. No luck tho. ---
**Author:** ![Yongjun\_Choi](https://sea2.discourse-cdn.com/flex020/user_avatar/community.sendbird.com/yongjun_choi/32/36_2.png) [@Yongjun\_Choi](https://community.sendbird.com/u/Yongjun_Choi)\ **Post date:** [March 28, 2022, 10:34am UTC](https://community.sendbird.com/t/crash-when-disconnecting-from-a-channel/4267/5 "2022-03-28T10:34:19Z")
@jack UIKit manages its own connection. Please do not call connect or disconnect directly. (I think it’ll be easier.) ---
**Author:** ![jack](https://avatars.discourse-cdn.com/v4/letter/j/cc9497/32.png) [@jack](https://community.sendbird.com/u/jack)\ **Post date:** [March 28, 2022, 10:53am UTC](https://community.sendbird.com/t/crash-when-disconnecting-from-a-channel/4267/6 "2022-03-28T10:53:28Z")
Thanks for the reply. However, we have to restrict the connection due to the **limit of peak concurrent users**. Is there any workaround to disconnect from a `ChannelActivity` without crashing the app? ---
**Author:** ![jack](https://avatars.discourse-cdn.com/v4/letter/j/cc9497/32.png) [@jack](https://community.sendbird.com/u/jack)\ **Post date:** [March 29, 2022, 5:34am UTC](https://community.sendbird.com/t/crash-when-disconnecting-from-a-channel/4267/7 "2022-03-29T05:34:58Z")
@Yongjun_Choi @Doo_Rim Is there a handler observing user ID once `init` is succeeded? It seems like the app inevitably crashes no matter where I disconnect from the server. ---
**Author:** ![Doo\_Rim](https://sea2.discourse-cdn.com/flex020/user_avatar/community.sendbird.com/doo_rim/32/239_2.png) [@Doo\_Rim](https://community.sendbird.com/u/Doo_Rim)\ **Post date:** [March 30, 2022, 12:23am UTC](https://community.sendbird.com/t/crash-when-disconnecting-from-a-channel/4267/8 "2022-03-30T00:23:20Z")
Hi @jack I am sorry that I didn’t understand what you want to implement. If you refer to our sample. there are processes of `sign in` and `sign out`. ---
**Author:** ![jack](https://avatars.discourse-cdn.com/v4/letter/j/cc9497/32.png) [@jack](https://community.sendbird.com/u/jack)\ **Post date:** [March 30, 2022, 2:34am UTC](https://community.sendbird.com/t/crash-when-disconnecting-from-a-channel/4267/9 "2022-03-30T02:34:26Z")
Hi @Doo_Rim , Thanks for your reply and sorry for the confusion. The goal is simple. We’re required to create a 1-on-1 channel using 2 user IDs. When the conversation is ended, we need to disconnect from the Sendbird server. The provided samples do have sign out process with `ChannelListActivity`. However, it does not include an entry to `ChannelActivity` in the `HomeActivity`. For instance, we’re creating a channel like the following. ```auto GroupChannel.createChannelWithUserIds(ids, true) { channel , e -> val intent = ChannelActivity.newIntentFromCustomActivity(context, CustomChannelActivity.class, channel.url) startActivity(intent) } ``` The only problem here is that the channel creation works well while it crash when we call `SendBirdUIKit.disconnect` after the `ChannelActivity` is finished. (The crash doesn’t occur when `ChannelListActivity` is finished - Just like how you sign out in the UIKit samples) Thanks again!