diff --git a/plugins/chunter-resources/src/channelDataProvider.ts b/plugins/chunter-resources/src/channelDataProvider.ts
index 31fc5c95fc..47ae48ca5f 100644
--- a/plugins/chunter-resources/src/channelDataProvider.ts
+++ b/plugins/chunter-resources/src/channelDataProvider.ts
@@ -216,7 +216,8 @@ export class ChannelDataProvider implements IChannelDataProvider {
   }
 
   async updateNewTimestamp (context?: DocNotifyContext): Promise<void> {
-    this.context = context ?? this.context
+    if (context === undefined) return
+    this.context = context
     const firstNewMsgIndex = await this.getFirstNewMsgIndex()
     const metadata = get(this.metadataStore)
     this.newTimestampStore.set(firstNewMsgIndex !== undefined ? metadata[firstNewMsgIndex]?.createdOn : undefined)
diff --git a/plugins/chunter-resources/src/components/ReverseChannelScrollView.svelte b/plugins/chunter-resources/src/components/ReverseChannelScrollView.svelte
index 9863ceee4d..89908ba69e 100644
--- a/plugins/chunter-resources/src/components/ReverseChannelScrollView.svelte
+++ b/plugins/chunter-resources/src/components/ReverseChannelScrollView.svelte
@@ -13,17 +13,7 @@
 // limitations under the License.
 -->
 <script lang="ts">
-  import core, {
-    Doc,
-    generateId,
-    getCurrentAccount,
-    Ref,
-    Space,
-    Timestamp,
-    Tx,
-    TxCUD,
-    TxProcessor
-  } from '@hcengineering/core'
+  import core, { Doc, generateId, getCurrentAccount, Ref, Space, Timestamp, Tx, TxCUD } from '@hcengineering/core'
   import activity, { ActivityMessage } from '@hcengineering/activity'
   import { ModernButton, Scroller } from '@hcengineering/ui'
   import { addTxListener, getClient, removeTxListener } from '@hcengineering/presentation'
@@ -236,7 +226,7 @@
 
   function scrollToStartOfNew (): void {
     if (scrollDiv == null || lastMsgBeforeFreeze === undefined) return
-    if (needUpdateTimestamp) {
+    if (needUpdateTimestamp || $newTimestampStore === undefined) {
       void provider.updateNewTimestamp(notifyContext)
       needUpdateTimestamp = false
     }
@@ -346,7 +336,7 @@
 
   function read (): void {
     if (isFreeze() || notifyContext === undefined || !isScrollInitialized) return
-    readViewportMessages(messages, notifyContext, scrollDiv, contentDiv)
+    readViewportMessages(messages, notifyContext._id, scrollDiv, contentDiv)
   }
 
   function updateScrollData (): void {
diff --git a/plugins/chunter-resources/src/scroll.ts b/plugins/chunter-resources/src/scroll.ts
index 52c1f5670c..1b5886834f 100644
--- a/plugins/chunter-resources/src/scroll.ts
+++ b/plugins/chunter-resources/src/scroll.ts
@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 //
-import { getDay, type Timestamp } from '@hcengineering/core'
+import { getDay, type Ref, type Timestamp } from '@hcengineering/core'
 import { get } from 'svelte/store'
 import { sortActivityMessages } from '@hcengineering/activity-resources'
 import { type ActivityMessage, type DisplayActivityMessage } from '@hcengineering/activity'
@@ -144,7 +144,7 @@ let messagesToReadAccumulatorTimer: any
 
 export function readViewportMessages (
   messages: ActivityMessage[],
-  context: DocNotifyContext,
+  contextId: Ref<DocNotifyContext>,
   scrollDiv?: HTMLElement | null,
   contentDiv?: HTMLElement | null
 ): void {
@@ -166,6 +166,6 @@ export function readViewportMessages (
   messagesToReadAccumulatorTimer = setTimeout(() => {
     const messagesToRead = [...messagesToReadAccumulator]
     messagesToReadAccumulator.clear()
-    void readChannelMessages(sortActivityMessages(messagesToRead), context)
+    void readChannelMessages(sortActivityMessages(messagesToRead), contextId)
   }, 500)
 }
diff --git a/plugins/chunter-resources/src/utils.ts b/plugins/chunter-resources/src/utils.ts
index 9f70529618..438232254c 100644
--- a/plugins/chunter-resources/src/utils.ts
+++ b/plugins/chunter-resources/src/utils.ts
@@ -429,13 +429,16 @@ export function recheckNotifications (context: DocNotifyContext): void {
 
 export async function readChannelMessages (
   messages: DisplayActivityMessage[],
-  context: DocNotifyContext | undefined
+  contextId: Ref<DocNotifyContext>
 ): Promise<void> {
-  if (messages.length === 0 || context === undefined) {
+  if (messages.length === 0) {
     return
   }
 
   const inboxClient = InboxNotificationsClientImpl.getClient()
+  const context = get(inboxClient.contextById).get(contextId)
+  if (context === undefined) return
+
   const op = getClient().apply(undefined, 'readViewportMessages', true)
 
   try {
@@ -464,7 +467,6 @@ export async function readChannelMessages (
     const prevTimestamp = Math.max(storedTimestampUpdates ?? 0, context.lastViewedTimestamp ?? 0)
 
     if (prevTimestamp < newTimestamp) {
-      context.lastViewedTimestamp = newTimestamp
       contextsTimestampStore.update((store) => {
         store.set(context._id, newTimestamp)
         return store