diff --git a/frontend/src/pages/ChatPage.tsx b/frontend/src/pages/ChatPage.tsx
index 5693a2f..41e1df3 100644
--- a/frontend/src/pages/ChatPage.tsx
+++ b/frontend/src/pages/ChatPage.tsx
@@ -18,9 +18,10 @@ export default function ChatPage() {
   const cachedChats = useChatStore((state) => state.chats);
   const setChatsCache = useChatStore((state) => state.setChats);
   const updateChatCache = useChatStore((state) => state.updateChat);
+  const safeCachedChats = Array.isArray(cachedChats) ? cachedChats : [];
   
-  const [chats, setChats] = useState<Chat[]>(cachedChats); // Initialize with cached data
-  const [loading, setLoading] = useState(cachedChats.length === 0); // Don't show loading if we have cache
+  const [chats, setChats] = useState<Chat[]>(safeCachedChats); // Initialize with cached data
+  const [loading, setLoading] = useState(safeCachedChats.length === 0); // Don't show loading if we have cache
   const [error, setError] = useState<string | null>(null);
   
   // Selected chat state
@@ -68,7 +69,7 @@ export default function ChatPage() {
   useEffect(() => {
     const loadChats = async () => {
       try {
-        if (cachedChats.length === 0) {
+        if (safeCachedChats.length === 0) {
           setLoading(true);
         }
         setError(null);
@@ -93,7 +94,7 @@ export default function ChatPage() {
     };
 
     loadChats();
-  }, [chatId, setChatsCache]);
+  }, [chatId, safeCachedChats.length, setChatsCache]);
 
   useEffect(() => {
     if (selectedChat) {
diff --git a/frontend/src/services/chatService.ts b/frontend/src/services/chatService.ts
index e62a039..e4afad4 100644
--- a/frontend/src/services/chatService.ts
+++ b/frontend/src/services/chatService.ts
@@ -1,5 +1,22 @@
 import apiClient from './api';
 
+const extractArray = <T>(payload: unknown): T[] => {
+  if (Array.isArray(payload)) {
+    return payload as T[];
+  }
+
+  if (payload && typeof payload === 'object') {
+    const record = payload as Record<string, unknown>;
+    const candidates = [record.items, record.results, record.data, record.chats, record.messages];
+    const firstArray = candidates.find(Array.isArray);
+    if (firstArray) {
+      return firstArray as T[];
+    }
+  }
+
+  return [];
+};
+
 export type Chat = {
   chat_id: string;
   user_id: number;
@@ -34,14 +51,14 @@ const chatService = {
     const response = await apiClient.get('/chats/', {
       params: { offset, limit }
     });
-    return response.data;
+    return extractArray<Chat>(response.data);
   },
 
   async getChatMessages(chatId: string, offset: number = 0, limit: number = 50): Promise<Message[]> {
     const response = await apiClient.get(`/chats/${chatId}`, {
       params: { offset, limit }
     });
-    return response.data;
+    return extractArray<Message>(response.data);
   },
 
   async sendMessage(data: MessageCreate): Promise<Message> {
diff --git a/frontend/src/services/userService.ts b/frontend/src/services/userService.ts
index 384dfa9..3dc6abc 100644
--- a/frontend/src/services/userService.ts
+++ b/frontend/src/services/userService.ts
@@ -1,5 +1,22 @@
 import apiClient from './api';
 
+const extractUsersArray = (payload: unknown): User[] => {
+  if (Array.isArray(payload)) {
+    return payload as User[];
+  }
+
+  if (payload && typeof payload === 'object') {
+    const record = payload as Record<string, unknown>;
+    const candidates = [record.items, record.results, record.data, record.users];
+    const firstArray = candidates.find(Array.isArray);
+    if (firstArray) {
+      return firstArray as User[];
+    }
+  }
+
+  return [];
+};
+
 export interface User {
   id: number;
   display_name: string;
@@ -60,7 +77,7 @@ export const userService = {
     const response = await apiClient.get('/users/search', {
       params: { username, offset, limit }
     });
-    return response.data;
+    return extractUsersArray(response.data);
   },
 
   deleteAccount: async (): Promise<void> => {
diff --git a/frontend/src/store/chatStore.ts b/frontend/src/store/chatStore.ts
index 7b00f42..91b9638 100644
--- a/frontend/src/store/chatStore.ts
+++ b/frontend/src/store/chatStore.ts
@@ -14,11 +14,11 @@ export const useChatStore = create<ChatStore>()(
     (set) => ({
       chats: [],
       
-      setChats: (chats) => set({ chats }),
+      setChats: (chats) => set({ chats: Array.isArray(chats) ? chats : [] }),
       
       updateChat: (chatId, updates) => 
         set((state) => ({
-          chats: state.chats.map(chat => 
+          chats: (Array.isArray(state.chats) ? state.chats : []).map(chat => 
             chat.chat_id === chatId ? { ...chat, ...updates } : chat
           )
         })),