# iOS always crashes when deleting a channel (SBDMessageDatabase) **URL:** \ **Category:** iOS\ **Created:** [July 12, 2021, 4:51pm UTC](https://community.sendbird.com/t/ios-always-crashes-when-deleting-a-channel-sbdmessagedatabase/2621 "2021-07-12T16:51:50Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![finchat](https://avatars.discourse-cdn.com/v4/letter/f/c57346/32.png) [@finchat](https://community.sendbird.com/u/finchat)\ **Post date:** [July 12, 2021, 4:51pm UTC](https://community.sendbird.com/t/ios-always-crashes-when-deleting-a-channel-sbdmessagedatabase/2621/1 "2021-07-12T16:51:50Z")
Problem: The iOS app crashes whenever a channel is deleted regardless of whether it was deleted in the app or from the SendBird dashboard. Steps to reproduce: 1. Initialize SBD with SBDMain.initWithApplicationId() and then connect with SBDMain.connect() 2. Fetch the user’s channels with SBDGroupChannelListQuery.loadNextPage() Everything works as expected up to this point. I am fetching the channels I previously created perfectly fine. 1. Delete the channel either with the iOS sdk or on the dashboard. The app will now crash Throw Call Stack: 0 CoreFoundation 0x000000010fb2ffba \_\_exceptionPreprocess + 242 1 libobjc.A.dylib 0x0000000119860ff5 objc\_exception\_throw + 48 2 SendBirdSDK 0x00000001157700d3 +[SBDMessageDatabase removeAllMessagesWithChannelUrls:] + 514 3 SendBirdSDK 0x000000011580d0ba -[SBDCommandProcessor processChannelDeleted:] + 357 4 SendBirdSDK 0x000000011580b293 -[SBDCommandProcessor processSystemEvent:sender:] + 676 5 SendBirdSDK 0x0000000115807294 -[SBDCommandProcessor processCommand:shouldHandleBlock:] + 511 6 SendBirdSDK 0x000000011575bae5 \_\_103+[SBDMain connectWebSocketServerReconnect:userId:accessToken:sessionKey:fromOnError:completionHandler:]\_block\_invoke.423 + 197 7 SendBirdSDK 0x00000001157f1399 -[SBDWebSocketClient webSocket:didReceiveMessage:] + 376 8 SendBirdSDK 0x00000001157a3266 \_\_35-[SBDSessionWebSocketEngine listen]\_block\_invoke\_4 + 156 9 libdispatch.dylib 0x000000011c321578 \_dispatch\_call\_block\_and\_release + 12 10 libdispatch.dylib 0x000000011c32274e \_dispatch\_client\_callout + 8 11 libdispatch.dylib 0x000000011c328f9a \_dispatch\_lane\_serial\_drain + 796 12 libdispatch.dylib 0x000000011c329c67 \_dispatch\_lane\_invoke + 436 13 libdispatch.dylib 0x000000011c335a7a \_dispatch\_workloop\_worker\_thread + 872 14 libsystem\_pthread.dylib 0x000000011c7f545d \_pthread\_wqthread + 314 15 libsystem\_pthread.dylib 0x000000011c7f442f start\_wqthread + 15 I believe the problem is in SBDMessageDatabase.removeAllMessagesWithChannelUrls() The application is connected to the sendbird sdk through a websocket and when it tries to remove all the messages in the channel, the application crashes and throws the error: “Terminating app due to uncaught exception ‘Sendbird Exception’, reason: ‘Database error.’” Please make an update to resolve this issue. Thanks ---
**Author:** ![Woo](https://sea2.discourse-cdn.com/flex020/user_avatar/community.sendbird.com/woo/32/125_2.png) [@Woo](https://community.sendbird.com/u/Woo)\ **Post date:** [July 12, 2021, 7:17pm UTC](https://community.sendbird.com/t/ios-always-crashes-when-deleting-a-channel-sbdmessagedatabase/2621/2 "2021-07-12T19:17:23Z")
@finchat could you tell me environment settings and version? thanks ---
**Author:** ![finchat](https://avatars.discourse-cdn.com/v4/letter/f/c57346/32.png) [@finchat](https://community.sendbird.com/u/finchat)\ **Post date:** [July 12, 2021, 8:22pm UTC](https://community.sendbird.com/t/ios-always-crashes-when-deleting-a-channel-sbdmessagedatabase/2621/3 "2021-07-12T20:22:35Z")
Hi @Woo I’m using the latest version of SendBird - 3.0.227 iOS Deployment Target - Tested with version 11.0 and 14.5 Tested with iPhone 11 simulator and physical iPhone 11 Please let me know if you need more info ---
**Author:** ![finchat](https://avatars.discourse-cdn.com/v4/letter/f/c57346/32.png) [@finchat](https://community.sendbird.com/u/finchat)\ **Post date:** [July 12, 2021, 10:56pm UTC](https://community.sendbird.com/t/ios-always-crashes-when-deleting-a-channel-sbdmessagedatabase/2621/4 "2021-07-12T22:56:10Z")
Hi @Woo I have more information: SBDGroupChannel.sendUserMessage() is causing a crash as well. There is something very wrong with the database on the latest version. I tried reverting back to version 3.0.216 and everything works as expected. I will be using this version for now. ---
**Author:** ![Woo](https://sea2.discourse-cdn.com/flex020/user_avatar/community.sendbird.com/woo/32/125_2.png) [@Woo](https://community.sendbird.com/u/Woo)\ **Post date:** [July 12, 2021, 11:26pm UTC](https://community.sendbird.com/t/ios-always-crashes-when-deleting-a-channel-sbdmessagedatabase/2621/5 "2021-07-12T23:26:48Z")
local caching feature is included in latest version, I will check with exception handling. you can use 3.0.226 ---
**Author:** ![Woo](https://sea2.discourse-cdn.com/flex020/user_avatar/community.sendbird.com/woo/32/125_2.png) [@Woo](https://community.sendbird.com/u/Woo)\ **Post date:** [July 12, 2021, 11:27pm UTC](https://community.sendbird.com/t/ios-always-crashes-when-deleting-a-channel-sbdmessagedatabase/2621/6 "2021-07-12T23:27:19Z")
Do you mind to share the crash you experience on sendUsesrMessage too? ---
**Author:** ![finchat](https://avatars.discourse-cdn.com/v4/letter/f/c57346/32.png) [@finchat](https://community.sendbird.com/u/finchat)\ **Post date:** [July 12, 2021, 11:43pm UTC](https://community.sendbird.com/t/ios-always-crashes-when-deleting-a-channel-sbdmessagedatabase/2621/7 "2021-07-12T23:43:23Z")
Yes, I can confirm 3.0.226 is working well. Here’s the call stack for the crash: 2021-07-12 16:42:52.521997-0700 FinChat[13448:8276204] \*\*\* Terminating app due to uncaught exception ‘Sendbird Exception’, reason: ‘Database error.’ \*\*\* First throw call stack: ( 0 CoreFoundation 0x000000010c6abfba \_\_exceptionPreprocess + 242 1 libobjc.A.dylib 0x00000001162c1ff5 objc\_exception\_throw + 48 2 SendBirdSDK 0x00000001121f32ea +[SBDGroupChannelDatabase insertOrReplaceWithChannels:] + 512 3 SendBirdSDK 0x000000011222ea77 -[SBDChannelDataSource updateChannel:] + 173 4 SendBirdSDK 0x0000000112261cbe \_\_48-[SBDCommandProcessor processNewMessage:sender:]\_block\_invoke\_2 + 166 5 libdispatch.dylib 0x0000000118d82578 \_dispatch\_call\_block\_and\_release + 12 6 libdispatch.dylib 0x0000000118d8374e \_dispatch\_client\_callout + 8 7 libdispatch.dylib 0x0000000118d91b3f \_dispatch\_main\_queue\_callback\_4CF + 1152 8 CoreFoundation 0x000000010c6198f8 **CFRUNLOOP\_IS\_SERVICING\_THE\_MAIN\_DISPATCH\_QUEUE** + 9 9 CoreFoundation 0x000000010c614169 \_\_CFRunLoopRun + 2781 10 CoreFoundation 0x000000010c6131a7 CFRunLoopRunSpecific + 567 11 GraphicsServices 0x000000011a930d85 GSEventRunModal + 139 12 UIKitCore 0x00000001220ba4df -[UIApplication \_run] + 912 13 UIKitCore 0x00000001220bf39c UIApplicationMain + 101 14 FinChat 0x000000010af227a8 main + 56 15 libdyld.dylib 0x0000000118e11bbd start + 1 ) libc++abi: terminating with uncaught exception of type NSException ---
**Author:** ![Woo](https://sea2.discourse-cdn.com/flex020/user_avatar/community.sendbird.com/woo/32/125_2.png) [@Woo](https://community.sendbird.com/u/Woo)\ **Post date:** [July 13, 2021, 12:37am UTC](https://community.sendbird.com/t/ios-always-crashes-when-deleting-a-channel-sbdmessagedatabase/2621/8 "2021-07-13T00:37:28Z")
Got it. Please use 226 version until we release new version. (226 is enough for a while since local caching is still not GA) ---
**Author:** ![Tez](https://sea2.discourse-cdn.com/flex020/user_avatar/community.sendbird.com/tez/32/146_2.png) [@Tez](https://community.sendbird.com/u/Tez)\ **Post date:** [July 15, 2021, 7:47am UTC](https://community.sendbird.com/t/ios-always-crashes-when-deleting-a-channel-sbdmessagedatabase/2621/9 "2021-07-15T07:47:28Z")
@finchat We have released the hotfix version. Please update version to **SendBirdSDK 3.0.228**.