diff --git a/ts/ConversationController.preload.ts b/ts/ConversationController.preload.ts
index 1e047634ed..3f103fca4b 100644
--- a/ts/ConversationController.preload.ts
+++ b/ts/ConversationController.preload.ts
@@ -261,6 +261,21 @@ export class ConversationController {
     conversation: ConversationModel,
     previousAttributes: ConversationAttributesType
   ): void {
+    if (!this.#_initialFetchComplete) {
+      log.warn(
+        `conversationChanged: Initial fetch is incomplete; ignoring change from ${conversation.idForLogging()}`
+      );
+      return;
+    }
+
+    const existing = this.get(conversation.id);
+    if (!existing) {
+      log.warn(
+        `conversationChanged: Rejecting change from ${conversation.idForLogging()}, not in lookups`
+      );
+      return;
+    }
+
     // eslint-disable-next-line no-param-reassign
     conversation.cachedProps = undefined;
 
diff --git a/ts/state/ducks/conversations.preload.ts b/ts/state/ducks/conversations.preload.ts
index 09c8519159..78beeb9f77 100644
--- a/ts/state/ducks/conversations.preload.ts
+++ b/ts/state/ducks/conversations.preload.ts
@@ -1537,7 +1537,12 @@ function markConversationRead(
 ): ThunkAction<void, RootStateType, unknown, NoopActionType> {
   return async dispatch => {
     const model = window.ConversationController.get(conversationId);
-    strictAssert(model, 'Conversation must be found');
+    if (!model) {
+      log.error(
+        'markConversationRead: Conversation not found, returning early'
+      );
+      return;
+    }
     model.setMarkedUnread(false);
 
     const lastMessage = await DataReader.getLastConversationMessage({
@@ -4865,7 +4870,10 @@ function onConversationOpened(
     const promises: Array<Promise<void>> = [];
     const conversation = window.ConversationController.get(conversationId);
     if (!conversation) {
-      throw new Error('onConversationOpened: Conversation not found');
+      log.error(
+        `onConversationOpened: Conversation with id ${conversationId} not found`
+      );
+      return;
     }
 
     const logId = `onConversationOpened(${conversation.idForLogging()})`;
diff --git a/ts/state/selectors/conversations.dom.ts b/ts/state/selectors/conversations.dom.ts
index a48532fec8..2a5ce58688 100644
--- a/ts/state/selectors/conversations.dom.ts
+++ b/ts/state/selectors/conversations.dom.ts
@@ -92,7 +92,7 @@ import { countAllChatFoldersMutedStats } from '../../util/countMutedStats.std.js
 
 const { isNumber, pick } = lodash;
 
-const log = createLogger('conversations');
+const log = createLogger('selectors/conversations');
 
 export type ConversationWithStoriesType = ConversationType & {
   hasStories?: HasStories;
diff --git a/ts/state/smart/ChatsTab.preload.tsx b/ts/state/smart/ChatsTab.preload.tsx
index e9a3f8dd9c..707a151848 100644
--- a/ts/state/smart/ChatsTab.preload.tsx
+++ b/ts/state/smart/ChatsTab.preload.tsx
@@ -2,6 +2,8 @@
 // SPDX-License-Identifier: AGPL-3.0-only
 import React, { memo, useEffect, useRef } from 'react';
 import { useSelector } from 'react-redux';
+
+import { createLogger } from '../../logging/log.std.js';
 import { ChatsTab } from '../../components/ChatsTab.dom.js';
 import type { SmartConversationViewProps } from './ConversationView.preload.js';
 import { SmartConversationView } from './ConversationView.preload.js';
@@ -14,7 +16,6 @@ import { usePrevious } from '../../hooks/usePrevious.std.js';
 import { TargetedMessageSource } from '../ducks/conversationsEnums.std.js';
 import { useConversationsActions } from '../ducks/conversations.preload.js';
 import { useToastActions } from '../ducks/toast.preload.js';
-import { strictAssert } from '../../util/assert.std.js';
 import { isStagingServer } from '../../util/isStagingServer.dom.js';
 import { ToastType } from '../../types/Toast.dom.js';
 import { getNavTabsCollapsed } from '../selectors/items.dom.js';
@@ -28,6 +29,8 @@ import {
   getTargetedMessageSource,
 } from '../selectors/conversations.dom.js';
 
+const log = createLogger('smart/ChatsTab');
+
 function renderConversationView(props: SmartConversationViewProps) {
   return <SmartConversationView {...props} />;
 }
@@ -100,7 +103,10 @@ export const SmartChatsTab = memo(function SmartChatsTab() {
       const conversation = window.ConversationController.get(
         selectedConversationId
       );
-      strictAssert(conversation, 'Conversation must be found');
+      if (!conversation) {
+        log.error('Conversation not found, returning early');
+        return;
+      }
       conversation.setMarkedUnread(false);
     }
   }, [prevConversationId, selectedConversationId]);