diff --git a/frontend/src/components/KLineChart.tsx b/frontend/src/components/KLineChart.tsx
index 83b0315..7516014 100644
--- a/frontend/src/components/KLineChart.tsx
+++ b/frontend/src/components/KLineChart.tsx
@@ -12,7 +12,7 @@ interface Props {
 
 export default function KLineChart({ kline, realtime, addedDate, stockCode, stockName }: Props) {
   const chartRef = useRef<HTMLDivElement>(null)
-  const instance = useRef<echarts.ECharts>()
+  const instance = useRef<echarts.ECharts>(null)
 
   useEffect(() => {
     if (!chartRef.current) return
diff --git a/frontend/src/components/SearchBar.tsx b/frontend/src/components/SearchBar.tsx
index 32fd219..ea29ebc 100644
--- a/frontend/src/components/SearchBar.tsx
+++ b/frontend/src/components/SearchBar.tsx
@@ -10,7 +10,7 @@ export default function SearchBar({ onSelect }: Props) {
   const [query, setQuery] = useState('')
   const [results, setResults] = useState<StockItem[]>([])
   const [open, setOpen] = useState(false)
-  const timer = useRef<ReturnType<typeof setTimeout>>()
+  const timer = useRef<ReturnType<typeof setTimeout> | undefined>(undefined)
   const ref = useRef<HTMLDivElement>(null)
 
   useEffect(() => {
diff --git a/frontend/src/pages/HomePage.tsx b/frontend/src/pages/HomePage.tsx
index cfa507e..d128e1f 100644
--- a/frontend/src/pages/HomePage.tsx
+++ b/frontend/src/pages/HomePage.tsx
@@ -29,18 +29,6 @@ export default function HomePage() {
     window.location.reload()
   }
 
-  const handleAddToExisting = async (colId: number) => {
-    if (!pendingStock) return
-    await addStock(colId, {
-      code: pendingStock.code,
-      name: pendingStock.name,
-      added_date: addedDate,
-    })
-    setShowModal(false)
-    setPendingStock(null)
-    window.location.reload()
-  }
-
   return (
     <div style={{ maxWidth: 800, margin: '0 auto', padding: '24px 16px' }}>
       <h1 style={{ fontSize: 24, fontWeight: 700, marginBottom: 8 }}>A股追踪</h1>