diff --git a/src/components/left/settings/SettingsPrivacyVisibilityExceptionList.tsx b/src/components/left/settings/SettingsPrivacyVisibilityExceptionList.tsx
index 746585fe7..d9369e7d1 100644
--- a/src/components/left/settings/SettingsPrivacyVisibilityExceptionList.tsx
+++ b/src/components/left/settings/SettingsPrivacyVisibilityExceptionList.tsx
@@ -64,7 +64,7 @@ const SettingsPrivacyVisibilityExceptionList: FC<OwnProps & StateProps> = ({
     // No need for expensive global updates on chats, so we avoid them
     const chatsById = getGlobal().chats.byId;
 
-    const chatIds = unique([...folderAllOrderedIds, ...folderArchivedOrderedIds])
+    const chatIds = unique([...folderAllOrderedIds || [], ...folderArchivedOrderedIds || []])
       .filter((chatId) => {
         const chat = chatsById[chatId];
         return chat && ((isUserId(chat.id) && chat.id !== currentUserId) || isChatGroup(chat));
diff --git a/src/components/left/settings/folders/SettingsFoldersChatFilters.tsx b/src/components/left/settings/folders/SettingsFoldersChatFilters.tsx
index b454532a8..8212ae971 100644
--- a/src/components/left/settings/folders/SettingsFoldersChatFilters.tsx
+++ b/src/components/left/settings/folders/SettingsFoldersChatFilters.tsx
@@ -52,7 +52,7 @@ const SettingsFoldersChatFilters: FC<OwnProps> = ({
     // No need for expensive global updates on chats, so we avoid them
     const chatsById = getGlobal().chats.byId;
 
-    const chatIds = [...folderAllOrderedIds, ...folderArchivedOrderedIds];
+    const chatIds = [...folderAllOrderedIds || [], ...folderArchivedOrderedIds || []];
     return unique([
       ...selectedChatIds,
       ...filterChatsByName(lang, chatIds, chatsById, chatFilter),
diff --git a/src/components/right/management/ManageGroup.tsx b/src/components/right/management/ManageGroup.tsx
index 398290b63..9065caff8 100644
--- a/src/components/right/management/ManageGroup.tsx
+++ b/src/components/right/management/ManageGroup.tsx
@@ -87,7 +87,7 @@ const ManageGroup: FC<OwnProps & StateProps> = ({
   const currentAbout = chat.fullInfo ? (chat.fullInfo.about || '') : '';
 
   const [isProfileFieldsTouched, setIsProfileFieldsTouched] = useState(false);
-  const [title, setTitle] = useState(currentTitle);
+  const [title, setTitle] = useState(currentTitle || '');
   const [about, setAbout] = useState(currentAbout);
   const [photo, setPhoto] = useState<File | undefined>();
   const [error, setError] = useState<string | undefined>();
diff --git a/src/components/right/management/ManageGroupAdminRights.tsx b/src/components/right/management/ManageGroupAdminRights.tsx
index 714a6c720..cc83b7eff 100644
--- a/src/components/right/management/ManageGroupAdminRights.tsx
+++ b/src/components/right/management/ManageGroupAdminRights.tsx
@@ -57,7 +57,7 @@ const ManageGroupAdminRights: FC<OwnProps & StateProps> = ({
   const { updateChatAdmin } = getDispatch();
 
   const [permissions, setPermissions] = useState<ApiChatAdminRights>({});
-  const [isTouched, setIsTouched] = useState(isNewAdmin);
+  const [isTouched, setIsTouched] = useState(Boolean(isNewAdmin));
   const [isLoading, setIsLoading] = useState(false);
   const [isDismissConfirmationDialogOpen, openDismissConfirmationDialog, closeDismissConfirmationDialog] = useFlag();
   const [customTitle, setCustomTitle] = useState('');
diff --git a/src/components/right/management/ManageReactions.tsx b/src/components/right/management/ManageReactions.tsx
index 2071c9cd2..9ec4953fe 100644
--- a/src/components/right/management/ManageReactions.tsx
+++ b/src/components/right/management/ManageReactions.tsx
@@ -38,7 +38,7 @@ const ManageReactions: FC<OwnProps & StateProps> = ({
   const lang = useLang();
   const [isTouched, setIsTouched] = useState(false);
   const [isLoading, setIsLoading] = useState(false);
-  const [localEnabledReactions, setLocalEnabledReactions] = useState(enabledReactions);
+  const [localEnabledReactions, setLocalEnabledReactions] = useState(enabledReactions || []);
 
   useHistoryBack(isActive, onClose);
 
@@ -53,9 +53,11 @@ const ManageReactions: FC<OwnProps & StateProps> = ({
   }, [chat, localEnabledReactions, setChatEnabledReactions]);
 
   useEffect(() => {
-    setIsLoading(false);
-    setIsTouched(false);
-    setLocalEnabledReactions(enabledReactions || []);
+    if (enabledReactions) {
+      setIsLoading(false);
+      setIsTouched(false);
+      setLocalEnabledReactions(enabledReactions);
+    }
   }, [enabledReactions]);
 
   const handleReactionChange = useCallback((e: React.ChangeEvent<HTMLInputElement>) => {
diff --git a/src/lib/teact/teact.ts b/src/lib/teact/teact.ts
index 465bc8659..7224dcd51 100644
--- a/src/lib/teact/teact.ts
+++ b/src/lib/teact/teact.ts
@@ -463,6 +463,8 @@ export function setTarget($element: VirtualElement, target: Node) {
   }
 }
 
+export function useState<T>(): [T, StateHookSetter<T>];
+export function useState<T>(initial: T): [T, StateHookSetter<T>];
 export function useState<T>(initial?: T): [T, StateHookSetter<T>] {
   const { cursor, byCursor } = renderingInstance.hooks.state;
 
diff --git a/src/util/folderManager.ts b/src/util/folderManager.ts
index 1710ac428..5634a42e0 100644
--- a/src/util/folderManager.ts
+++ b/src/util/folderManager.ts
@@ -79,12 +79,12 @@ const prepared: {
 };
 
 const results: {
-  orderedIdsByFolderId: Record<string, string[]>;
-  chatsCountByFolderId: Record<string, number>;
+  orderedIdsByFolderId: Record<string, string[] | undefined>;
+  chatsCountByFolderId: Record<string, number | undefined>;
   unreadCountersByFolderId: Record<string, {
     chatsCount: number;
     notificationsCount: number;
-  }>;
+  } | undefined>;
 } = {
   orderedIdsByFolderId: {},
   chatsCountByFolderId: {},
@@ -596,7 +596,7 @@ function buildFolderUnreadCounters(folderId: number) {
     orderedIdsByFolderId: { [folderId]: orderedIds },
   } = results;
 
-  return orderedIds.reduce((newUnreadCounters, chatId) => {
+  return orderedIds!.reduce((newUnreadCounters, chatId) => {
     const chatSummary = chatSummariesById.get(chatId);
     if (!chatSummary) {
       return newUnreadCounters;