On my website, when I go to the revisions for a node:
https://www.example.org/node/2959/revisions/view/38665/39409/split_fields
We get the following error
Call to a member function getDisplayName() on null
in Drupal\diff\DiffLayoutBase->buildRevisionData()
line 182 of modules/contrib/diff/src/DiffLayoutBase.php
The problem is that $revision->getRevisionUser() is returning null.
This is a probably a case of bad data on my site, but I attach my patch here in case someone finds it useful.
The fix is simply to do a check for null:
$revision_link['author'] = [
'#type' => 'link',
'#title' => ($revision_user = $revision->getRevisionUser()) ? $revision_user->getDisplayName() : '',
Closed: duplicate
1.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
This fixed the issue for me on a project I'm working now.
#11 worked for me too.
In my case the revision user had been deleted (so getDisplayName() was called on null).
This is a duplicate of 🐛 Prevent fatal error if the revision has no author Needs work