diff --git a/stock/analysis/Common.py b/stock/analysis/Common.py
index bb2c158..a9ae161 100644
--- a/stock/analysis/Common.py
+++ b/stock/analysis/Common.py
@@ -643,9 +643,10 @@ class Common:
                     check = True
 
             # slow_k가 10이하에서 상승 중이고 slow_d를 상승 돌파 할 때
-            if stock['slow_k'][1] < stock['slow_d'][1] and stock['slow_d'][0] < stock['slow_k'][0] and stock['slow_k'][0] < 10:
-                if stock['avg120'][0] < stock['trend_k'][0]:
-                    check = True
+            if stock['slow_k'][0] is not None and stock['slow_k'][1] is not None:
+                if stock['slow_k'][1] < stock['slow_d'][1] and stock['slow_d'][0] < stock['slow_k'][0] and stock['slow_k'][0] < 10:
+                    if stock['avg120'][0] < stock['trend_k'][0]:
+                        check = True
 
         return check