fix crash of app on rendering pin item

ts/components/leftpane/conversation-list-item/HeaderItem.tsx

@@ -11,7 +11,8 @@ import { ContextConversationId } from './ConversationListItem';
 import { UserItem } from './UserItem';
 
 const NotificationSettingIcon = (props: { isMessagesSection: boolean }) => {
-  const convoSetting = useSelector(useConversationPropsById)?.currentNotificationSetting;
+  const convoId = useContext(ContextConversationId);
+  const convoSetting = useConversationPropsById(convoId)?.currentNotificationSetting;
 
   if (!props.isMessagesSection) {
     return null;

ts/components/menu/Menu.tsx

@@ -155,11 +155,11 @@ export const getPinConversationMenuItem = (conversationId: string): JSX.Element
 
   if (isMessagesSection) {
     const conversation = getConversationController().get(conversationId);
-    const isPinned = conversation.isPinned();
+    const isPinned = conversation?.isPinned() || false;
 
     const togglePinConversation = async () => {
       if ((!isPinned && nbOfAlreadyPinnedConvos < maxNumberOfPinnedConversations) || isPinned) {
-        await conversation.setIsPinned(!isPinned);
+        await conversation?.setIsPinned(!isPinned);
       } else {
         ToastUtils.pushToastWarning(
           'pinConversationLimitToast',