diff --git a/combo_plugin_nanterre/views.py b/combo_plugin_nanterre/views.py
index a79a1c5..c7f0dfa 100644
--- a/combo_plugin_nanterre/views.py
+++ b/combo_plugin_nanterre/views.py
@@ -72,7 +72,7 @@ def saga_transaction(request):
                      'for num_factures=%s', num_factures)
         messages.error(request, ERROR_MESSAGE)
         return HttpResponseRedirect(error_url)
-    if not isinstance(saga, dict) or not saga.get('data', {}).get('url'):
+    if not isinstance(saga, dict):
         logger.error('[rsu/saga] failed to create transaction '
                      'for num_factures=%s, received bad response=%r',
                      num_factures, saga)
@@ -91,6 +91,12 @@ def saga_transaction(request):
                        num_factures, saga['err'])
         messages.error(request, ERROR_MESSAGE)
         return HttpResponseRedirect(error_url)
+    if not saga.get('data', {}).get('url'):
+        logger.error('[rsu/saga] failed to create transaction '
+                     'for num_factures=%s, response without url: %r',
+                     num_factures, saga)
+        messages.error(request, ERROR_MESSAGE)
+        return HttpResponseRedirect(error_url)
 
     # finally, response seems good! redirect to payment system URL
     logger.info('[rsu/saga] new transaction created '