diff --git a/lib/utils.ts b/lib/utils.ts
index 25c2452..9d8362d 100644
--- a/lib/utils.ts
+++ b/lib/utils.ts
@@ -155,7 +155,7 @@ export const getFormattedTodayDate = () => new Date().toLocaleDateString('en-US'
 });
 
 export function formatSymbolForTradingView(symbol: string): string {
-    if (!symbol) return symbol;
+    if (!symbol) return '';
     const upperSymbol = symbol.toUpperCase();
     
     // Shanghai