I want to send email to members with a link to the membership renewal page profiled with their data. I create a suitable link including the contact ID and checksum, of the form


If I'm logged and the link is for me then it works. If I'm not logged a Fatal Error is generated, and the site (WP) presents the message "The site is experiencing technical difficulties".

Nothing appears in the CiviCRM log, but in the Apache log I see:

Sep 09 13:56:02 [Wed Sep 09 12:56:02.301893 2020] [php7:error] [pid 203] [client] PHP Fatal error: Uncaught CRM_Core_Exception: [0: One of parameters (value: ) is not of the type Integer\n\n thrown in /app/data/wp-content/plugins/civicrm/civicrm/CRM/Utils/Type.php on line 470 Sep 09 13:56:02 - - [09/Sep/2020:12:56:01 +0000] "GET /civicrm?page=CiviCRM&q=civicrm/contribute/transact&reset=1&id=2&cid=213&cs=1ccf75cf22138bd255525af8c8c05dc4_1599646931_168 HTTP/1.1" 500 3081 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:80.0) Gecko/20100101 Firefox/80.0"

Using Civi 5.29 with WP 5.21. I had the same problem using Civi 5.25.0. I'm using a Cloudron LAMP stack, which makes things a little more complicated.

Any pointers most welcome.

  • 2
    Not an answer as such, but for the front-end, use civiwp=CiviCRM rather than page=CiviCRM. Also, I'd recommend using Clean URLs. I'll follow up if that makes no difference. Sep 9, 2020 at 13:16
  • if that helps i think it should be added as an Answer
    – petednz - fuzion
    Sep 9, 2020 at 20:08
  • Thanks. I'll check that out.
    – Graham
    Sep 10, 2020 at 8:50
  • Update. Nope:using civiwp=CiviCRM makes no difference. And clean URLs doesn't work either - that's where I'd started. If I remove the query string elements containing the contact Id and checksum I can reach the page fine (with clean URLS, with page= and with civiwp=). The problem seems to be with how Civi is handling the query
    – Graham
    Sep 10, 2020 at 8:58
  • What happens if you remove the &reset=1 part? The URLs that work for me don't have that - I used the Contact Checksum UI extension to generate them FWIW civicrm.org/extensions/contact-checksum-ui Sep 11, 2020 at 20:02

1 Answer 1


I would guess that anonymous users are not able to view and use contribution pages. Confirm and change this at:

Administer->Users and Permissions->Permissions (Access Control)->Wordpress Access Control.



  • A reasonable suggestion, but not relevant in this case. If I point my browser to the contribution page address without the query string containing contact ID and checksum, the page renders fine whether I'm logged in or not.
    – Graham
    Sep 17, 2020 at 15:34

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