import utility produces warnings

[ggieling]

Description

When uploading pages from another wiki using the import utility, the site produces warnings.
End result is that the pages are uploaded, it is therefore not a big issue, but might require attention

The messages are:
Warning: Undefined variable $lang in /srv/http/won1/content/lib/plugins/advanced/admin/import.php on line 133

Warning: Trying to access array offset on value of type null in /srv/http/won1/content/lib/plugins/advanced/admin/import.php on line 133

Steps to reproduce

1. export pages from another wiki
2. upload in new wiki

Steps to solve

???

Versions

• [Bootstrap3 Template] v2022-07-27 (stable/20220727)
• [DokuWiki] 2022-07-31a "Igor"
• [Plugins]
  ACL manager
  advanced plugin (2022-12-10)
  authpdo
  plain auth
  configuration manager
  extension manager
  info
  logviewer
  popularity feedback
  revert
  safefnrecode
  styling
  translation
  dokuwiki upgrade
  user manager
  video sharing site
  wrap
• [PHP] 8.1.13
• [Browser] firefox 109.0; chromium 109.0.5414.74

Screenshots or Logs

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Sample page or snippet

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[fiwswe]

Seems to be missing a global $lang; declaration in the cmd_import() method?