diff --git a/Bithumb_daily.py b/Bithumb_daily.py
index 1f92f23..c33e26f 100644
--- a/Bithumb_daily.py
+++ b/Bithumb_daily.py
@@ -604,6 +604,9 @@ class Bithumb_daily(HTS):
 
         stock = {"CODE": ticker, "NAME": ticker, "PRICE": []}
         df = pybithumb.get_ohlcv(ticker)
+        if df is None:
+            return
+
         close = pybithumb.get_current_price(ticker)
 
         size = len(df)
diff --git a/Bithumb_minute.py b/Bithumb_minute.py
index ae35045..c4614e2 100644
--- a/Bithumb_minute.py
+++ b/Bithumb_minute.py
@@ -675,6 +675,8 @@ class Bithumb_minute(HTS):
         """
 
         df = self.get_ohlcv(ticker)
+        if df is None:
+            return
         close = pybithumb.get_current_price(ticker)
 
         size = len(df)
@@ -717,6 +719,8 @@ class Bithumb_minute(HTS):
 
                 if max(bsLine['sell'][len(bsLine['sell']) - 2:]) > 100:
                     tmp = self.bithumb.get_balance(ticker)
+                    if tmp is None:
+                        return
                     count = tmp[0]
                     order = self.bithumb.sell_limit_order(ticker, bsLine['sell'][len(bsLine['sell'])-1], count)