User.name is nil sometimes

[sudara]

irb(main):002:0> Job.last
  Job Load (0.3ms)  SELECT "jobs".* FROM "jobs" ORDER BY "jobs"."id" DESC LIMIT $1  [["LIMIT", 1]]
=> #<Job id: 47, status: "failed", arguments: "--super -n 20 --branch master    /4799/company/cus...", log_filename: "perf-check-job-47.log", queued_at: "2019-09-10 20:03:38", run_at: "2019-09-10 20:03:38", completed_at: nil, failed_at: "2019-09-10 20:04:18", canceled_at: nil, created_at: "2019-09-10 20:03:38", updated_at: "2019-09-10 20:04:18", branch: "master", result_details: nil, user_id: 7, github_html_url: nil, output: nil>
irb(main):003:0> Job.last.user
  Job Load (0.4ms)  SELECT "jobs".* FROM "jobs" ORDER BY "jobs"."id" DESC LIMIT $1  [["LIMIT", 1]]
  User Load (0.2ms)  SELECT "users".* FROM "users" WHERE "users"."id" = $1 LIMIT $2  [["id", 7], ["LIMIT", 1]]
=> #<User id: 7, name: nil, github_login: "aoeuaoeu", github_avatar_url: "https://avatars3.githubusercontent.com/u/4aoeuaoeu2?...", created_at: "2019-09-10 19:21:45", updated_at: "2019-09-10 19:21:45">