diff --git a/lightrag/api/__init__.py b/lightrag/api/__init__.py
index f43e00be..c5bed57c 100644
--- a/lightrag/api/__init__.py
+++ b/lightrag/api/__init__.py
@@ -1 +1 @@
-__api_version__ = "0164"
+__api_version__ = "0165"
diff --git a/lightrag_webui/src/features/RetrievalTesting.tsx b/lightrag_webui/src/features/RetrievalTesting.tsx
index 70ff2e7d..0744ae5e 100644
--- a/lightrag_webui/src/features/RetrievalTesting.tsx
+++ b/lightrag_webui/src/features/RetrievalTesting.tsx
@@ -12,6 +12,16 @@ import { EraserIcon, SendIcon } from 'lucide-react'
 import { useTranslation } from 'react-i18next'
 import type { QueryMode } from '@/api/lightrag'
 
+// Helper function to generate unique IDs with browser compatibility
+const generateUniqueId = () => {
+  // Use crypto.randomUUID() if available
+  if (typeof crypto !== 'undefined' && typeof crypto.randomUUID === 'function') {
+    return crypto.randomUUID();
+  }
+  // Fallback to timestamp + random string for browsers without crypto.randomUUID
+  return `id-${Date.now()}-${Math.random().toString(36).substring(2, 9)}`;
+};
+
 export default function RetrievalTesting() {
   const { t } = useTranslation()
   const [messages, setMessages] = useState<MessageWithError[]>(() => {
@@ -108,13 +118,13 @@ export default function RetrievalTesting() {
       // Create messages
       // Save the original input (with prefix if any) in userMessage.content for display
       const userMessage: MessageWithError = {
-        id: crypto.randomUUID(), // Add unique ID
+        id: generateUniqueId(), // Use browser-compatible ID generation
         content: inputValue,
         role: 'user'
       }
 
       const assistantMessage: MessageWithError = {
-        id: crypto.randomUUID(), // Add unique ID
+        id: generateUniqueId(), // Use browser-compatible ID generation
         content: '',
         role: 'assistant',
         mermaidRendered: false