diff --git a/stock/analysis/Common.py b/stock/analysis/Common.py
index 6c7e39d..7523898 100644
--- a/stock/analysis/Common.py
+++ b/stock/analysis/Common.py
@@ -629,13 +629,15 @@ class Common:
         if stock['upper'][0] < stock['high'][0]:
             # 볼린저 밴드 width 로 매수 시점
             for i in range(10):
-                if stock['width'][i+1] < 20 and 20 < stock['width'][i]:
-                    check = True
-                    break
+                if len(stock['width']) > 2:
+                    if stock['width'][i+1] < 20 and 20 < stock['width'][i]:
+                        check = True
+                        break
                 # 볼린저 밴드 %B와 MFI로 매수 시점
-                if 80 < stock['pb'][i+1] and 80 < stock['mfi'][i]:
-                    check = True
-                    break
+                if len(stock['pb']) > 2 and len(stock['mfi']) > 2:
+                    if 80 < stock['pb'][i+1] and 80 < stock['mfi'][i]:
+                        check = True
+                        break
         return check
 
     # 낙폭 과대 체크