diff --git a/config/initializers/doorkeeper.rb b/config/initializers/doorkeeper.rb
index ffd7015c1..3acb954fc 100644
--- a/config/initializers/doorkeeper.rb
+++ b/config/initializers/doorkeeper.rb
@@ -49,7 +49,7 @@ Doorkeeper.configure do
   # Define access token scopes for your provider
   # For more information go to
   # https://github.com/doorkeeper-gem/doorkeeper/wiki/Using-Scopes
-  # default_scopes  :public
+  default_scopes :public
   # optional_scopes :write, :update
 
   # Change the way client credentials are retrieved from the request object.
diff --git a/config/locales/en.yml b/config/locales/en.yml
index ceaeadcdc..8a6bac494 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -78,6 +78,13 @@ en:
         failed_to_save: "Failed to create new user"
 
   doorkeeper:
+    errors:
+      messages:
+        invalid_request:
+          unknown: 'The request is missing a required parameter, includes an unsupported parameter value, or is otherwise malformed.'
+          missing_param: 'Missing required parameter: %{value}.'
+          not_support_pkce: 'Invalid code_verifier parameter. Server does not support pkce.'
+          request_not_authorized: 'Request need to be authorized. Required parameter for authorizing request is missing or invalid.'
     authorizations:
       buttons:
         authorize: "Authorize"
diff --git a/db/migrate/20210217114042_update_doorkeeper_table.rb b/db/migrate/20210217114042_update_doorkeeper_table.rb
new file mode 100644
index 000000000..a249591b8
--- /dev/null
+++ b/db/migrate/20210217114042_update_doorkeeper_table.rb
@@ -0,0 +1,12 @@
+class UpdateDoorkeeperTable < ActiveRecord::Migration[6.1]
+  def change
+    reversible do |dir|
+      dir.up do
+        change_column :oauth_access_grants, :scopes, :string, null: false, default: ''
+      end
+      dir.down do
+        change_column :oauth_access_grants, :scopes, :string
+      end
+    end
+  end
+end
diff --git a/db/structure.sql b/db/structure.sql
index 989184ab0..7745597a3 100644
--- a/db/structure.sql
+++ b/db/structure.sql
@@ -922,7 +922,7 @@ CREATE TABLE public.oauth_access_grants (
     redirect_uri text NOT NULL,
     created_at timestamp without time zone NOT NULL,
     revoked_at timestamp without time zone,
-    scopes character varying
+    scopes character varying DEFAULT ''::character varying NOT NULL
 );
 
 
@@ -4927,10 +4927,10 @@ CREATE INDEX index_repository_cells_on_repository_row_id ON public.repository_ce
 
 
 --
--- Name: index_repository_cells_on_value_type_and_value_id; Type: INDEX; Schema: public; Owner: -
+-- Name: index_repository_cells_on_value; Type: INDEX; Schema: public; Owner: -
 --
 
-CREATE INDEX index_repository_cells_on_value_type_and_value_id ON public.repository_cells USING btree (value_type, value_id);
+CREATE INDEX index_repository_cells_on_value ON public.repository_cells USING btree (value_type, value_id);
 
 
 --
@@ -5711,10 +5711,10 @@ CREATE INDEX index_view_states_on_user_id ON public.view_states USING btree (use
 
 
 --
--- Name: index_view_states_on_viewable_type_and_viewable_id; Type: INDEX; Schema: public; Owner: -
+-- Name: index_view_states_on_viewable; Type: INDEX; Schema: public; Owner: -
 --
 
-CREATE INDEX index_view_states_on_viewable_type_and_viewable_id ON public.view_states USING btree (viewable_type, viewable_id);
+CREATE INDEX index_view_states_on_viewable ON public.view_states USING btree (viewable_type, viewable_id);
 
 
 --
@@ -7153,6 +7153,7 @@ INSERT INTO "schema_migrations" (version) VALUES
 ('20201126203713'),
 ('20201209165626'),
 ('20210128105457'),
-('20210128105458');
+('20210128105458'),
+('20210217114042');