FrozenError: can't modify frozen String: "1 0 obj\n" when saving a pdf on 1.0.27~1.0.29 versions

[isaporto]

Hello! I apologize for giving you more work!

I am using the CombinePDF gem for the textbox feature, but when I try to save the pdf, it always give me the following error:

pry(main)> pdf.save "public/pdf-test.pdf"
FrozenError: can't modify frozen String: "1 0 obj\n"
from /home/isaporto/.rbenv/versions/2.7.2/lib/ruby/gems/2.7.0/gems/combine_pdf-1.0.27/lib/combine_pdf/renderer.rb:112:in `force_encoding'

I tried on versions 1.0.29, 1.0.28, 1.0.27, but only it worked on 1.0.26 version.

Rails version: 6.1.7.9
Ruby version: 2.7.2p137
combine_pdf gem versions: 1.0.27~1.0.29
OS: Windows 11 + WSL2