fix

db/migrate/20191112100418_migrate_gcc_project_team.rb

@@ -6,7 +6,8 @@ class MigrateGccProjectTeam < ActiveRecord::Migration[5.2]
       all_login = [['mu2pwryse', 'pljq3f9xp', 'pfx7gfmiz'], ['p9rs7xtfl', 'prx72s8uc', 'plezci23p', 'pjysrikw7'], ['m40352189', 'p05394287'],
                    ['m9ozhx83t', 'p05296348'], ['p35490268', 'p48921607', 'p24019738'], ['p29165708', 'm43960821']]
       all_login.each do |user_login|
-        leader = User.find_by!(login: user_login.first)
+        leader = User.find_by(login: user_login.first)
+        next if leader.blank?
         team = CompetitionTeam.create!(name: "#{leader.real_name}组", user_id: leader.id, competition_id: 8)
         team.generate_invite_code
         team.save!