diff --git a/docs/api.rst b/docs/api.rst
index 7d5f840..97783e9 100644
--- a/docs/api.rst
+++ b/docs/api.rst
@@ -58,3 +58,6 @@ Exceptions
 
 .. autoclass:: flask_discord.Unauthorized
     :members:
+
+.. autoclass:: flask_discord.AccessDenied
+    :members:
diff --git a/flask_discord/client.py b/flask_discord/client.py
index b723b7e..1538cee 100644
--- a/flask_discord/client.py
+++ b/flask_discord/client.py
@@ -2,7 +2,7 @@ import jwt
 import typing
 import discord
 
-from . import configs, _http, models, utils
+from . import configs, _http, models, utils, exceptions
 
 from oauthlib.common import add_params_to_uri
 from flask import request, session, redirect, current_app
@@ -144,8 +144,12 @@ class DiscordOAuth2Session(_http.DiscordOAuth2HttpClient):
         `session <http://flask.pocoo.org/docs/1.0/api/#flask.session>`_ object.
 
         """
-        if request.values.get("error"):
-            return request.values["error"]
+        error = request.values.get("error")
+        if error:
+            if error == "access_denied":
+                raise exceptions.AccessDenied()
+            raise exceptions.HttpException(error)
+
         state = self.__get_state()
         token = self._fetch_token(state)
         self.save_authorization_token(token)
diff --git a/flask_discord/exceptions.py b/flask_discord/exceptions.py
index 58407b6..3b057bc 100644
--- a/flask_discord/exceptions.py
+++ b/flask_discord/exceptions.py
@@ -42,3 +42,7 @@ class RateLimited(HttpException):
 
 class Unauthorized(HttpException):
     """A HTTP Exception raised when user is not authorized."""
+
+
+class AccessDenied(HttpException):
+    """Exception raised when user cancels OAuth authorization grant."""