diff --git a/dkb_robo/portfolio.py b/dkb_robo/portfolio.py
index f252ba2..fe3454f 100644
--- a/dkb_robo/portfolio.py
+++ b/dkb_robo/portfolio.py
@@ -204,7 +204,7 @@ def _details(self, account: Dict[str, str], aid: str) -> Dict[str, str]:
         for my_field, dkb_field in mapping_dic.items():
             if my_field == 'limit':
                 try:
-                    output_dic[my_field] = float(account.get('attributes', {}).get(dkb_field, None))
+                    output_dic[my_field] = float(account.get('attributes', {}).get(dkb_field, 0))
                 except Exception as exc:
                     self.logger.error('limit conversion error: %s', exc)
                     output_dic[my_field] = None
@@ -265,7 +265,7 @@ def _details(self, card: Dict[str, str], cid: str) -> Dict[str, str]:
         self.logger.debug('portfolio.Card._details()\n')
 
         try:
-            limit = float(card.get('attributes', {}).get('limit', {}).get('value', None))
+            limit = float(card.get('attributes', {}).get('limit', {}).get('value', 0))
         except Exception as exc:
             self.logger.error('limit conversion error: %s', exc)
             limit = None
diff --git a/dkb_robo/standingorder.py b/dkb_robo/standingorder.py
index 3f9113a..35b1ebf 100644
--- a/dkb_robo/standingorder.py
+++ b/dkb_robo/standingorder.py
@@ -22,7 +22,7 @@ def _filter(self, full_list: Dict[str, str]) -> List[Dict[str, str]]:
             for ele in full_list['data']:
 
                 try:
-                    amount = float(ele.get('attributes', {}).get('amount', {}).get('value', None))
+                    amount = float(ele.get('attributes', {}).get('amount', {}).get('value', 0))
                 except Exception as err:
                     self.logger.error('api.StandingOrder._filter() error: %s', err)
                     amount = None
diff --git a/test/test_portfolio.py b/test/test_portfolio.py
index c10576d..0196a5c 100644
--- a/test/test_portfolio.py
+++ b/test/test_portfolio.py
@@ -311,9 +311,7 @@ def test_018__sort(self):
                         'status': {'category': 'active'},
                         'transactions': None,
                         'type': 'debitcard'}}
-        with self.assertLogs('dkb_robo', level='INFO') as lcm:
-            self.assertEqual(result, self.overview._sort(data))
-        self.assertIn("ERROR:dkb_robo:limit conversion error: float() argument must be a string or a real number, not 'NoneType'", lcm.output)
+        self.assertEqual(result, self.overview._sort(data))
 
     def test_019__sort(self):
         """ test _sort() """
@@ -423,9 +421,7 @@ def test_019__sort(self):
                         'productgroup': None,
                         'transactions': 'https://banking.dkb.de/api/broker/brokerage-accounts/baccountid1/positions?include=instrument%2Cquote',
                         'type': 'depot'}}
-        with self.assertLogs('dkb_robo', level='INFO') as lcm:
-            self.assertEqual(result, self.overview._sort(data))
-        self.assertIn("ERROR:dkb_robo:limit conversion error: float() argument must be a string or a real number, not 'NoneType'", lcm.output)
+        self.assertEqual(result, self.overview._sort(data))
 
 class TestAccount(unittest.TestCase):
     """ test class """
@@ -455,9 +451,7 @@ def test_022__balance(self):
     def test_023__details(self):
         """ test _details() """
         account = {'attributes': {'iban': 'iban', 'bic': 'bic', 'accountNumber': 'accountNumber', 'bankCode': 'bankCode', 'accountType': 'accountType', 'balance': 'balance'}}
-        with self.assertLogs('dkb_robo', level='INFO') as lcm:
-            self.assertEqual({'type': 'account', 'name': None, 'id': 'aid', 'transactions': 'https://banking.dkb.de/api/accounts/accounts/aid/transactions', 'date': None, 'iban': 'iban', 'account': 'iban', 'holdername': None, 'limit': None}, self.account._details(account, 'aid'))
-        self.assertIn("ERROR:dkb_robo:limit conversion error: float() argument must be a string or a real number, not 'NoneType'", lcm.output)
+        self.assertEqual({'type': 'account', 'name': None, 'id': 'aid', 'transactions': 'https://banking.dkb.de/api/accounts/accounts/aid/transactions', 'date': None, 'iban': 'iban', 'account': 'iban', 'holdername': None, 'limit': 0.0}, self.account._details(account, 'aid'))
 
     @patch('dkb_robo.portfolio.Account._balance')
     @patch('dkb_robo.portfolio.Account._details')
diff --git a/test/test_standingorder.py b/test/test_standingorder.py
index d7a03cd..f016b4f 100644
--- a/test/test_standingorder.py
+++ b/test/test_standingorder.py
@@ -126,10 +126,8 @@ def test_007__filter(self):
                         }
                     }
                 }]}
-        result = [{'amount': None, 'currencycode': None, 'purpose': 'description', 'recpipient': 'cardname', 'creditoraccount': {'iban': 'crediban', 'bic': 'credbic'}, 'interval': {'from': '2020-01-01', 'until': '2025-12-01', 'frequency': 'monthly', 'nextExecutionAt': '2020-02-01'}}]
-        with self.assertLogs('dkb_robo', level='INFO') as lcm:
-            self.assertEqual(result, self.dkb._filter(full_list))
-        self.assertIn("ERROR:dkb_robo:api.StandingOrder._filter() error: float() argument must be a string or a real number, not 'NoneType'", lcm.output)
+        result = [{'amount': 0.0, 'currencycode': None, 'purpose': 'description', 'recpipient': 'cardname', 'creditoraccount': {'iban': 'crediban', 'bic': 'credbic'}, 'interval': {'from': '2020-01-01', 'until': '2025-12-01', 'frequency': 'monthly', 'nextExecutionAt': '2020-02-01'}}]
+        self.assertEqual(result, self.dkb._filter(full_list))
 
 if __name__ == '__main__':