Unsubscribe is giving an error with Drupal 7.69 and CiviCRM 5.23.4. We did not have any issues or errors during the upgrade process.

Unsubscribe links from mailings load the confirmation page correctly, with the correct partially obscured test****@domain.org. But when I fill in the email address and click Unsubscribe, it displays:

Sorry, due to an error, we are unable to fulfill your request at the moment. You may want to contact your administrator or service provider with more details about what action you were performing when this occurred. Missing Parameters

The unsubscribe page is loaded with this URL:


We included the unsubscribe link in our CiviMail mailings as follows:

<p><a href="{action.unsubscribeUrl}" target="_blank">Unsubscribe from this list</a></p>

Log shows this message:

$Fatal Error Details = array(3) {
  string(18) "Missing Parameters"
  object(CRM_Core_Exception)#2268 (10) {
    array(1) {
    string(18) "Missing Parameters"
  • 1
    I just replicated this on a site we had pushed up to 5.24 - will raise with th maintenance team as this seems to be a regression of some sort
    – petednz - fuzion
    Apr 13, 2020 at 23:05
  • I've logged an issue here: lab.civicrm.org/dev/core/-/issues/1773 as I'm still finding it is a problem on 5.24.5 - occasionally May 21, 2020 at 6:55

2 Answers 2


It appears this issue is fixed in CiviCRM 5.24.5. We upgraded and re-tested and unsubscribe now works.


This will be fixed in PR #17081 and will be part of 5.24.3. You can either wait for the release or apply patch from here.

  • Just noting this doesn't look like it will be reviewed / tested in time for 5.24.3 so will be in another release soon
    – eileen
    Apr 16, 2020 at 2:21

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.