[Bug] videoDetails - inv_sig_helper not installed

[adequacy1]

Describe the bug
Error Missing hash key: "videoDetails" (KeyError) on any video

Steps to Reproduce

1. Go to http://invi.lan:3000/watch?v=e9AveogthMA (invi.lan is my selfhosting Linux invidious instance)
2. See Error

Logs
Title: Missing hash key: "videoDetails" (KeyError)
Date: 2025-05-17T06:09:13Z
Route: /watch?v=e9AveogthMA
Version: 2025.05.14-03f89be9 @ master

Backtrace

Missing hash key: "videoDetails" (KeyError)
  from /usr/lib/invidious/invidious in '??'
  from /usr/lib/invidious/invidious in '??'
  from /usr/lib/invidious/invidious in '??'
  from /usr/lib/invidious/invidious in '??'
  from /usr/lib/invidious/invidious in '??'
  from /usr/lib/invidious/invidious in '??'
  from /usr/lib/invidious/invidious in '??'
  from /usr/lib/invidious/invidious in '??'
  from /usr/lib/invidious/invidious in '??'
  from /usr/lib/invidious/invidious in '??'
  from /usr/lib/invidious/invidious in '??'
  from /usr/lib/invidious/invidious in '??'
  from /usr/lib/invidious/invidious in '??'
  from /usr/lib/invidious/invidious in '??'
  from /usr/lib/invidious/invidious in '??'
  from /usr/lib/invidious/invidious in '??'
  from /usr/lib/invidious/invidious in '??'
  from /usr/lib/invidious/invidious in '??'
  from /usr/lib/invidious/invidious in '??'
  from /usr/lib/invidious/invidious in '??'
  from /usr/lib/invidious/invidious in '??'
  from /usr/lib/invidious/invidious in '??'
  from /usr/lib/invidious/invidious in '??'
  from ???

Additional context
Browser Chromium 136.0.7103.113
OS Arch Linux updated

[unixfox]

@syeopite this error happens when neither inv_sig_helper nor companion is installed.

If we still want to offer the ability to not require both of them, we should disable the watch page and print an error.

Otherwise we get issues like these.

[syeopite]

Well this is something that should get "fixed" by #5237

[unixfox]

Well this is something that should get "fixed" by #5237

Yeah but that PR is taking ages to get ready. We should submit a small code for handling this issue meanwhile.

[emanueljg]

I get the exact same error despite having inv_sig_helper installed.

[syeopite]

Please let me know if this PR fixes the issue #5312 it probably won't fix video playback but at least the /watch page should load more consistently.

[dennis1248]

If you are experiencing this issue despite having inv_sig_helper set up, you may have to generate a new po_token and visitor_data as documented here.