diff --git a/src/oidcop/__init__.py b/src/oidcop/__init__.py
index de2c3aa2..90a3e6a1 100644
--- a/src/oidcop/__init__.py
+++ b/src/oidcop/__init__.py
@@ -1,6 +1,6 @@
 import secrets
 
-__version__ = "2.3.0"
+__version__ = "2.3.1"
 
 DEF_SIGN_ALG = {
     "id_token": "RS256",
diff --git a/src/oidcop/oidc/userinfo.py b/src/oidcop/oidc/userinfo.py
index d6a4ceb1..6e6ce978 100755
--- a/src/oidcop/oidc/userinfo.py
+++ b/src/oidcop/oidc/userinfo.py
@@ -118,7 +118,7 @@ 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