Backup creation fails on empty wiki

root@git:/home/git/gitlab# cat VERSION 
7.9.3

root@git:/home/git/gitlab# sudo -u git -H bundle exec rake gitlab:backup:create RAILS_ENV=production --trace
** Invoke gitlab:backup:create (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute gitlab:backup:create
** Invoke gitlab:backup:db:create (first_time)
** Invoke environment 
** Execute gitlab:backup:db:create
Dumping database ... 
Dumping PostgreSQL database gitlabhq_production ... [DONE]
done
** Invoke gitlab:backup:repo:create (first_time)
** Invoke environment 
** Execute gitlab:backup:repo:create
Dumping repositories ...
 * nojestorget/ntcrm ... [DONE]
 * nojestorget/ntcrm.wiki ... rake aborted!
NoMethodError: undefined method `empty?' for nil:NilClass
/home/git/gitlab/app/models/repository.rb:25:in `empty?'
/home/git/gitlab/lib/backup/repository.rb:35:in `block in dump'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/activerecord-4.1.9/lib/active_record/relation/batches.rb:52:in `block (2 levels) in find_each'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/activerecord-4.1.9/lib/active_record/relation/batches.rb:52:in `each'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/activerecord-4.1.9/lib/active_record/relation/batches.rb:52:in `block in find_each'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/activerecord-4.1.9/lib/active_record/relation/batches.rb:125:in `find_in_batches'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/activerecord-4.1.9/lib/active_record/relation/batches.rb:51:in `find_each'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/activerecord-4.1.9/lib/active_record/querying.rb:9:in `find_each'
/home/git/gitlab/lib/backup/repository.rb:10:in `dump'
/home/git/gitlab/lib/tasks/gitlab/backup.rake:41:in `block (4 levels) in <top (required)>'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rake-10.4.2/lib/rake/task.rb:240:in `call'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rake-10.4.2/lib/rake/task.rb:240:in `block in execute'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rake-10.4.2/lib/rake/task.rb:235:in `each'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rake-10.4.2/lib/rake/task.rb:235:in `execute'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rake-10.4.2/lib/rake/task.rb:179:in `block in invoke_with_call_chain'
/usr/local/rvm/rubies/ruby-2.1.5/lib/ruby/2.1.0/monitor.rb:211:in `mon_synchronize'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rake-10.4.2/lib/rake/task.rb:172:in `invoke_with_call_chain'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rake-10.4.2/lib/rake/task.rb:165:in `invoke'
/home/git/gitlab/lib/tasks/gitlab/backup.rake:12:in `block (3 levels) in <top (required)>'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rake-10.4.2/lib/rake/task.rb:240:in `call'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rake-10.4.2/lib/rake/task.rb:240:in `block in execute'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rake-10.4.2/lib/rake/task.rb:235:in `each'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rake-10.4.2/lib/rake/task.rb:235:in `execute'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rake-10.4.2/lib/rake/task.rb:179:in `block in invoke_with_call_chain'
/usr/local/rvm/rubies/ruby-2.1.5/lib/ruby/2.1.0/monitor.rb:211:in `mon_synchronize'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rake-10.4.2/lib/rake/task.rb:172:in `invoke_with_call_chain'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rake-10.4.2/lib/rake/task.rb:165:in `invoke'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rake-10.4.2/lib/rake/application.rb:150:in `invoke_task'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rake-10.4.2/lib/rake/application.rb:106:in `block (2 levels) in top_level'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rake-10.4.2/lib/rake/application.rb:106:in `each'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rake-10.4.2/lib/rake/application.rb:106:in `block in top_level'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rake-10.4.2/lib/rake/application.rb:115:in `run_with_threads'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rake-10.4.2/lib/rake/application.rb:100:in `top_level'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rake-10.4.2/lib/rake/application.rb:78:in `block in run'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rake-10.4.2/lib/rake/application.rb:176:in `standard_exception_handling'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rake-10.4.2/lib/rake/application.rb:75:in `run'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/gems/rake-10.4.2/bin/rake:33:in `<top (required)>'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/bin/rake:23:in `load'
/home/git/gitlab/vendor/bundle/ruby/2.1.0/bin/rake:23:in `<main>'
Tasks: TOP => gitlab:backup:repo:create

I googled my error and this was the top hit. I'm experiencing something very similar. Is this a known issue? Any workarounds?

Added ~32010 label

Milestone changed to 7.10

@txc @daniel-king I'm closing this because old. Reopen if issue still exists.

Status changed to closed