diff --git a/lightrag/utils.py b/lightrag/utils.py
index c8786e7b..fd8e0adc 100644
--- a/lightrag/utils.py
+++ b/lightrag/utils.py
@@ -657,6 +657,10 @@ def get_conversation_turns(
     Returns:
         Formatted string of the conversation history
     """
+    # Check if num_turns is valid
+    if num_turns <= 0:
+        return ""
+
     # Group messages into turns
     turns: list[list[dict[str, Any]]] = []
     messages: list[dict[str, Any]] = []
diff --git a/lightrag_webui/src/App.tsx b/lightrag_webui/src/App.tsx
index 2c7e8001..1cf8c5e3 100644
--- a/lightrag_webui/src/App.tsx
+++ b/lightrag_webui/src/App.tsx
@@ -1,5 +1,5 @@
 import { useState, useCallback } from 'react'
-import ThemeProvider from '@/components/graph/ThemeProvider'
+import ThemeProvider from '@/components/ThemeProvider'
 import MessageAlert from '@/components/MessageAlert'
 import ApiKeyAlert from '@/components/ApiKeyAlert'
 import StatusIndicator from '@/components/graph/StatusIndicator'
diff --git a/lightrag_webui/src/components/graph/ThemeProvider.tsx b/lightrag_webui/src/components/ThemeProvider.tsx
similarity index 100%
rename from lightrag_webui/src/components/graph/ThemeProvider.tsx
rename to lightrag_webui/src/components/ThemeProvider.tsx
diff --git a/lightrag_webui/src/components/graph/ThemeToggle.tsx b/lightrag_webui/src/components/ThemeToggle.tsx
similarity index 100%
rename from lightrag_webui/src/components/graph/ThemeToggle.tsx
rename to lightrag_webui/src/components/ThemeToggle.tsx
diff --git a/lightrag_webui/src/features/SiteHeader.tsx b/lightrag_webui/src/features/SiteHeader.tsx
index 5446e382..6eef0bb9 100644
--- a/lightrag_webui/src/features/SiteHeader.tsx
+++ b/lightrag_webui/src/features/SiteHeader.tsx
@@ -1,6 +1,6 @@
 import Button from '@/components/ui/Button'
 import { SiteInfo } from '@/lib/constants'
-import ThemeToggle from '@/components/graph/ThemeToggle'
+import ThemeToggle from '@/components/ThemeToggle'
 import { TabsList, TabsTrigger } from '@/components/ui/Tabs'
 import { useSettingsStore } from '@/stores/settings'
 import { cn } from '@/lib/utils'
diff --git a/lightrag_webui/src/hooks/useTheme.tsx b/lightrag_webui/src/hooks/useTheme.tsx
index e1975174..5fb161a4 100644
--- a/lightrag_webui/src/hooks/useTheme.tsx
+++ b/lightrag_webui/src/hooks/useTheme.tsx
@@ -1,5 +1,5 @@
 import { useContext } from 'react'
-import { ThemeProviderContext } from '@/components/graph/ThemeProvider'
+import { ThemeProviderContext } from '@/components/ThemeProvider'
 
 const useTheme = () => {
   const context = useContext(ThemeProviderContext)
diff --git a/lightrag_webui/src/stores/settings.ts b/lightrag_webui/src/stores/settings.ts
index 84f5feac..60ae8f90 100644
--- a/lightrag_webui/src/stores/settings.ts
+++ b/lightrag_webui/src/stores/settings.ts
@@ -5,7 +5,7 @@ import { defaultQueryLabel } from '@/lib/constants'
 import { Message, QueryRequest } from '@/api/lightrag'
 
 type Theme = 'dark' | 'light' | 'system'
-type Tab = 'documents' | 'knowledge-graph' | 'retrieval'
+type Tab = 'documents' | 'knowledge-graph' | 'retrieval' | 'api'
 
 interface SettingsState {
   theme: Theme