1 files changed, 12 insertions, 3 deletions

diff --git a/app/graphql/mutations/issues/set_due_date.rb b/app/graphql/mutations/issues/set_due_date.rb
index da7892f4ed4..9cefac96b25 100644
--- a/app/graphql/mutations/issues/set_due_date.rb
+++ b/app/graphql/mutations/issues/set_due_date.rb
@@ -7,14 +7,23 @@ module Mutations
 
       argument :due_date,
                Types::TimeType,
-               required: true,
-               description: 'The desired due date for the issue.'
+               required: false,
+               description: 'The desired due date for the issue, ' \
+               'due date will be removed if absent or set to null'
+
+      def ready?(**args)
+        unless args.key?(:due_date)
+          raise Gitlab::Graphql::Errors::ArgumentError, 'Argument dueDate must be provided (`null` accepted)'
+        end
+
+        super
+      end
 
       def resolve(project_path:, iid:, due_date:)
         issue = authorized_find!(project_path: project_path, iid: iid)
         project = issue.project
 
-        ::Issues::UpdateService.new(project, current_user, due_date: due_date)
+        ::Issues::UpdateService.new(project: project, current_user: current_user, params: { due_date: due_date })
           .execute(issue)
 
         {