If you only have 1 language enabled together with the translation modules and then you activate the URL interface text language detection (Detection and selection), you get the following error:

TypeError: Argument 1 passed to Drupal\language\LanguageNegotiationMethodBase::setCurrentUser() must implement interface Drupal\Core\Session\AccountInterface

This seems to be because the LanguageSwitchLinks are disabled in this case, only on some admin pages.

I suggest to disable the alternate hreflang feature on admin pages to avoid this issue. Admin pages do not need to have a hreflang anyhow.

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#2 hreflang-typeerror-2821038-1-8.1.x.patch727 byteshoebekewim
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hoebekewim created an issue. See original summary.

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hoebekewim CreditAttribution: hoebekewim as a volunteer commented
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hreflang-typeerror-2821038-1-8.1.x.patch727 bytes

Suggested patch

  • mfb committed 6bf009c on 8.x-1.x 
    Issue #2821038 reported by hoebekewim: TypeError when a single language...
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mfb
they or he
CreditAttribution: mfb commented
Status: Active » Fixed

Thanks for reporting

Status: Fixed » Closed (fixed)

Automatically closed - issue fixed for 2 weeks with no activity.