diff --git a/iqoptionapi/stable_api.py b/iqoptionapi/stable_api.py
index 1ae24b6d..bdaf05f8 100644
--- a/iqoptionapi/stable_api.py
+++ b/iqoptionapi/stable_api.py
@@ -928,12 +928,16 @@ def buy_digital_spot(self, active, amount, action, duration):
         # And need to be on GMT time
 
         #Type - P or C
-        if action == 'put':
-            action = 'P'
-        elif action == 'call':
-            action = 'C'
+        if isinstance(action,string):
+            if action.lower() == 'put':
+                action = 'P'
+            elif action.lower() == 'call':
+                action = 'C'
+            else:
+                logging.error('buy_digital_spot active error')
+                return -1
         else:
-            logging.error('buy_digital_spot active error')
+            logging.error('buy_digital_spot active error: need action as text')
             return -1
         # doEURUSD201907191250PT5MPSPT
         timestamp = int(self.api.timesync.server_timestamp)