3 files changed, 9 insertions, 4 deletions
diff --git a/app/graphql/mutations/boards/lists/base.rb b/app/graphql/mutations/boards/lists/base.rb
index 34b271ba3b8..d244d6bf8dd 100644
--- a/app/graphql/mutations/boards/lists/base.rb
+++ b/app/graphql/mutations/boards/lists/base.rb
@@ -8,7 +8,7 @@ module Mutations
 
         argument :board_id, ::Types::GlobalIDType[::Board],
                  required: true,
-                 description: 'The Global ID of the issue board to mutate'
+                 description: 'Global ID of the issue board to mutate'
 
         field :list,
               Types::BoardListType,
diff --git a/app/graphql/mutations/boards/lists/create.rb b/app/graphql/mutations/boards/lists/create.rb
index 4f545709ee9..3fe1052315f 100644
--- a/app/graphql/mutations/boards/lists/create.rb
+++ b/app/graphql/mutations/boards/lists/create.rb
@@ -12,7 +12,7 @@ module Mutations
 
         argument :label_id, ::Types::GlobalIDType[::Label],
                  required: false,
-                 description: 'ID of an existing label'
+                 description: 'Global ID of an existing label'
 
         def ready?(**args)
           if args.slice(*mutually_exclusive_args).size != 1
@@ -39,6 +39,7 @@ module Mutations
 
         private
 
+        # Overridden in EE
         def authorize_list_type_resource!(board, params)
           return unless params[:label_id]
 
@@ -57,13 +58,15 @@ module Mutations
           create_list_service.execute(board)
         end
 
+        # Overridden in EE
         def create_list_params(args)
           params = args.slice(*mutually_exclusive_args).with_indifferent_access
-          params[:label_id] = GitlabSchema.parse_gid(params[:label_id]).model_id if params[:label_id]
+          params[:label_id] &&= ::GitlabSchema.parse_gid(params[:label_id], expected_type: ::Label).model_id
 
           params
         end
 
+        # Overridden in EE
         def mutually_exclusive_args
           [:backlog, :label_id]
         end
@@ -71,3 +74,5 @@ module Mutations
     end
   end
 end
+
+Mutations::Boards::Lists::Create.prepend_if_ee('::EE::Mutations::Boards::Lists::Create')
diff --git a/app/graphql/mutations/snippets/base.rb b/app/graphql/mutations/snippets/base.rb
index c8cc721b2e0..023f876d035 100644
--- a/app/graphql/mutations/snippets/base.rb
+++ b/app/graphql/mutations/snippets/base.rb
@@ -11,7 +11,7 @@ module Mutations
       private
 
       def find_object(id:)
-        GitlabSchema.object_from_id(id)
+        GitlabSchema.object_from_id(id, expected_type: ::Snippet)
       end
 
       def authorized_resource?(snippet)