diff --git a/web/app/components/base/chat/chat-with-history/hooks.tsx b/web/app/components/base/chat/chat-with-history/hooks.tsx
index 38666d13d9..4c94c86c1d 100644
--- a/web/app/components/base/chat/chat-with-history/hooks.tsx
+++ b/web/app/components/base/chat/chat-with-history/hooks.tsx
@@ -181,13 +181,14 @@ export const useChatWithHistory = (installedAppInfo?: InstalledApp) => {
   const handleConversationIdInfoChange = useCallback((changeConversationId: string) => {
     if (appId) {
       setConversationIdInfo((prev) => {
-        let prevValue = prev?.[appId || '']
-        if (typeof prevValue === 'string')
-          prevValue = {}
+        const prevAppConversations = prev?.[appId || '']
+        const base = typeof prevAppConversations === 'object' && prevAppConversations
+          ? prevAppConversations
+          : {}
         return {
           ...prev,
           [appId || '']: {
-            ...prevValue,
+            ...base,
             [userId || 'DEFAULT']: changeConversationId,
           },
         }
diff --git a/web/app/components/base/chat/embedded-chatbot/hooks.tsx b/web/app/components/base/chat/embedded-chatbot/hooks.tsx
index 281a1658e7..dafe608fb0 100644
--- a/web/app/components/base/chat/embedded-chatbot/hooks.tsx
+++ b/web/app/components/base/chat/embedded-chatbot/hooks.tsx
@@ -147,13 +147,14 @@ export const useEmbeddedChatbot = (appSourceType: AppSourceType, tryAppId?: stri
   const handleConversationIdInfoChange = useCallback((changeConversationId: string) => {
     if (appId) {
       setConversationIdInfo((prev) => {
-        let prevValue = prev?.[appId || '']
-        if (typeof prevValue === 'string')
-          prevValue = {}
+        const prevAppConversations = prev?.[appId || '']
+        const base = typeof prevAppConversations === 'object' && prevAppConversations
+          ? prevAppConversations
+          : {}
         return {
           ...prev,
           [appId || '']: {
-            ...prevValue,
+            ...base,
             [userId || 'DEFAULT']: changeConversationId,
           },
         }