linuxMint / ff : Uncaught TypeError: document.querySelector(...) is null

[aum7]

Describe the bug

context
build works ok, but with updated page (f5), if i enable 'development tools' (f12), i get 1 error notification:

Uncaught TypeError: document.querySelector(...) is null
   T   pydata-sphinx-theme.js:569
   r   mixin.js:12
   937   pydata-sphinx-theme.js:584
   a   async module:49
   937   pydata-sphinx-theme.js:1

expectation
I expected 0 (zero) error to occur.

explanation
i do have latin & arabic scripts mixed on every single page, and i actually
select all (ctrl-a)
copy-paste (ctrl-c - ctrl-v)
the text from pdf

os: linux mint 21.3
web browser: firefox
asus laptop with amd processor

thx for sharing

have fun

Reproduce the bug

build.tar.gz
attached is build files folder

List your environment

No response

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