diff --git a/stock/analysis/Common.py b/stock/analysis/Common.py
index 4be74e8..c96486d 100644
--- a/stock/analysis/Common.py
+++ b/stock/analysis/Common.py
@@ -574,8 +574,10 @@ class Common:
 
     def check_optimal_buy_timeing(self, param, stock):
         check = False
+        if len(stock['trend']) < 1:
+            return check
+
         rise_rate = param['bull'][0] / (param['bull'][0]+param['bear'][0]+param['bull'][0])
-        
         if (
                 (stock['macd'][1] < stock['macd'][0] and stock['rsi'][0] < 80) or
                 (stock['rsi'][1] < stock['rsi'][0] and np.min(stock['rsi'][:3]) < 35) or