diff --git a/Bithumb.py b/Bithumb.py
index cd4f47f..7e862d1 100644
--- a/Bithumb.py
+++ b/Bithumb.py
@@ -446,7 +446,7 @@ class Bithumb(HTS):
         if len(data.index) > 10:
             today = datetime.today().strftime('%Y%m%d')
             log_filename = os.path.join(RESOURCE_PATH, 'analysis', 'bithumb', today + '.log')
-            if not isRealTime and self.exist_buy(ticker, log_filename):
+            if not isRealTime and not self.exist_buy(ticker, log_filename):
                 if max(bsLine['buy'][len(bsLine['buy']) - 2:]) > 100:
                     balance = self.getBalance(ticker)
                     count = int(balance * (bsLine['buy_weight'][len(bsLine['buy_weight'])-1]/100))