diff --git a/app.py b/app.py
index 5bd526c..222ee72 100644
--- a/app.py
+++ b/app.py
@@ -97,8 +97,9 @@ def index():
 
         # vCard 4.0 erzeugen und speichern
         try:
-            # generate vcard using helper
-            generate_vcard(adresse, BASE_DIR)
+            # determine base dir: prefer app.config, then app attribute, then module BASE_DIR
+            base_dir = app.config.get('BASE_DIR') if app.config.get('BASE_DIR') else getattr(app, 'BASE_DIR', BASE_DIR)
+            generate_vcard(adresse, base_dir)
         except Exception:
             # nicht kritisch: bei Fehlern nicht die ganze Anfrage abbrechen
             pass
diff --git a/tests/test_vcard_export.py b/tests/test_vcard_export.py
index 94fdc1b..0802757 100644
--- a/tests/test_vcard_export.py
+++ b/tests/test_vcard_export.py
@@ -5,7 +5,7 @@ from app import app, db, Frage
 
 
 @pytest.fixture
-def client(tmp_path, monkeypatch):
+def client(tmp_path):
     # Use a temporary directory for vcards and a temporary sqlite db
     # temp DB file
     db_file = tmp_path / "test.db"
@@ -25,12 +25,14 @@ def client(tmp_path, monkeypatch):
         q = Frage(text='Testfrage?')
         db.session.add(q)
         db.session.commit()
+        # record question id for use in test POST data
+        app.config['TEST_QUESTION_ID'] = q.id
 
     with app.test_client() as test_client:
         yield test_client
 
 
-def test_vcard_created_after_submit(client, tmp_path):
+def test_vcard_created_after_submit(client):
     data = {
         'vorname': 'Max',
         'nachname': 'Mustermann',
@@ -42,7 +44,8 @@ def test_vcard_created_after_submit(client, tmp_path):
         'telefon_vorwahl': '49',
         'telefon_nummer': '1234567',
         'email': 'max@example.com',
-        'frage_1': 'Antwort'
+        # question id set in fixture
+        f'frage_{app.config.get("TEST_QUESTION_ID")}': 'Antwort'
     }
 
     # Submit the form