diff --git a/src/oidcop/oidc/userinfo.py b/src/oidcop/oidc/userinfo.py
index 1abbbaa0..42b12ec3 100755
--- a/src/oidcop/oidc/userinfo.py
+++ b/src/oidcop/oidc/userinfo.py
@@ -117,7 +117,7 @@ def process_request(self, request=None, **kwargs):
         _grant = _session_info["grant"]
         token = _grant.get_token(request["access_token"])
         # should be an access token
-        if token.token_class != "access_token":
+        if token and token.token_class != "access_token":
             return self.error_cls(error="invalid_token", error_description="Wrong type of token")
 
         # And it should be valid