Redmine

Hi,

When we try to export an issue to pdf which including private note gives below error;

ActionView::Template::Error (can't modify frozen String):
    1: <%= raw issue_to_pdf(@issue, :journals => @journals) %>
lib/redmine/export/pdf/issues_pdf_helper.rb:215:in `block in issue_to_pdf'
lib/redmine/export/pdf/issues_pdf_helper.rb:212:in `each'
lib/redmine/export/pdf/issues_pdf_helper.rb:212:in `issue_to_pdf'
app/views/issues/show.pdf.erb:1:in `_app_views_issues_show_pdf_erb___4376083027826501785_70101456999820'
lib/redmine/sudo_mode.rb:65:in `sudo_mode'

My installation is below;

Environment:
  Redmine version                4.1.0.stable
  Ruby version                   2.6.3-p62 (2019-04-16) [x86_64-linux]
  Rails version                  5.2.4.1
  Environment                    production
  Database adapter               Mysql2
  Mailer queue                   ActiveJob::QueueAdapters::AsyncAdapter
  Mailer delivery                smtp

Thanks,
Ahmet