Inline comments for first commit

When I try send inline comment for first commit file I get 500 response.
Logs:

NoMethodError (undefined method `line_code_for_position' for nil:NilClass):
lib/gitlab/diff/position.rb:136:in `line_code'
app/models/diff_note.rb:86:in `set_line_code'
app/services/notes/create_service.rb:14:in `execute'
app/controllers/projects/notes_controller.rb:25:in `create'
lib/gitlab/middleware/go.rb:16:in `call'