>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3391504. --> Reported by: [dcam](https://www.drupal.org/user/1791830) >>> <p>Sites that update to versions 2.1.0 or 1.1.0 may encounter the following error when a feed updates its items:</p> <blockquote><p>TypeError: Drupal\aggregator\Plugin\aggregator\parser\DefaultParser::parseDateModified(): Argument #2 ($normalize) must be of type bool, null given</p></blockquote> <p>Until a patch can be written you can fix this error by going to Aggregator's admin settings form at /admin/config/services/aggregator/settings and saving the settings. This will write a value for a missing setting into the site's configuration.</p>