Ensure a system ID exists when TAN mechanisms are fetched

diff --git a/fints/client.py b/fints/client.py
index 310a584279dc0c6672aa73a7f33e2283dac47262..182b6ddc74021e5322f9731870abd04e0abfb181 100644 (file)
--- a/fints/client.py
+++ b/fints/client.py
@@ -1120,6 +1120,7 @@ class FinTS3PinTanClient(FinTS3Client):
 
     def fetch_tan_mechanisms(self):
         self.set_tan_mechanism('999')
+        self._ensure_system_id()
         with self._new_dialog():
             return self.get_current_tan_mechanism()