GRPC::Unknown: 2:Rugged::IndexError: index does not contain Modules/Logging into User Accounts.txt at stage 0

https://sentry.gitlab.net/gitlab/gitlabcom/issues/1640734/events/fea0e42f37714497b1aa61697dd6fff8/

GRPC::Unknown: 2:Rugged::IndexError: index does not contain Modules/Logging into User Accounts.txt at stage 0
  from grpc/generic/active_call.rb:31:in `check_status'
  from grpc/generic/active_call.rb:181:in `attach_status_results_and_complete_call'
  from grpc/generic/active_call.rb:418:in `client_streamer'
  from grpc/generic/client_stub.rb:255:in `block in client_streamer'
  from grpc/generic/interceptors.rb:170:in `intercept!'
  from grpc/generic/client_stub.rb:254:in `client_streamer'
  from grpc/generic/service.rb:175:in `block (3 levels) in rpc_stub_class'
  from gitlab/gitaly_client.rb:192:in `execute'
  from gitlab/gitaly_client.rb:170:in `block in call'
  from gitlab/gitaly_client.rb:198:in `measure_timings'
  from gitlab/gitaly_client.rb:169:in `call'
  from gitlab/gitaly_client/wiki_service.rb:64:in `update_page'
  from gitlab/git/wiki.rb:147:in `gitaly_update_page'
  from gitlab/git/wiki.rb:85:in `block in update_page'
  from gitlab/git/wraps_gitaly_errors.rb:7:in `wrapped_gitaly_errors'
  from gitlab/git/wiki.rb:84:in `update_page'
  from wiki.rb:145:in `update_page'
  from wiki_page.rb:240:in `block in update'
  from wiki_page.rb:361:in `save'
  from wiki_page.rb:239:in `update'
  from wiki_pages/update_service.rb:9:in `execute'