diff --git a/tests/utils.py b/tests/utils.py
index 320d843..3c64993 100644
--- a/tests/utils.py
+++ b/tests/utils.py
@@ -33,7 +33,8 @@ def verify(reg, auth, cdh=None):
         cdh = auth.request.cdh
     auth.verify(cdh, credential_data.public_key)
     assert auth.auth_data.rp_id_hash == reg.auth_data.rp_id_hash
-    assert auth.credential["id"] == reg.auth_data.credential_data.credential_id
+    if auth.credential is not None:
+        assert auth.credential["id"] == reg.auth_data.credential_data.credential_id
 
 
 def generate_rp():