I am asking this question before I raise an issue in the hope that this a simple config problem - my simple testing has shown such fragility, it must be my end!

I've started the journey to port our CiviCRM on Drupal 7 to Drupal 9. All has gone really well (the porting guides are great) - everything basically 'works' and yesterday I got to looking at the forms. Reading, it seemed like the best approach was to just recreate the existing Drupal webforms that were integrated using webform_civicrm - this way you learn the new Webform approach and clear out the stuff the you do not need.

I created the simplest of forms by duping the template Contact form and then trying to add an 'existing contact' and a single Case to it - it immediately crashed:

The website encountered an unexpected error. Please try again later.

The log message was:

CiviCRM_API3_Exception: Expected one RelationshipType but found 0 in civicrm_api3() (line 135 of /var/www/html/vendor/civicrm/civicrm-core/api/api.php).

I've played around, using no template, using another template etc and also get other crashes at various points:

Drupal\Component\Plugin\Exception\PluginException: Plugin (webform_location_places) instance class "Drupal\webform\Plugin\WebformElement\WebformLocationPlaces" does not exist. in Drupal\Component\Plugin\Factory\DefaultFactory::getPluginClass() (line 97 of /var/www/html/web/core/lib/Drupal/Component/Plugin/Factory/DefaultFactory.php).

This sort of stuff is in the logs:

Notice: Undefined index: #form_key in Drupal\webform_civicrm\Plugin\WebformElement\CivicrmContact->wf_crm_contact_fields() (line 464 of /var/www/html/web/modules/contrib/webform_civicrm/src/Plugin/WebformElement/CivicrmContact.php)

The thing is I'm not trying (yet!) to do anything tricky. On Drupal 7 I use Webform extensively to create and update cases and activities and have never seen these types of crashes. Just want to know if there is any fragility I should be aware of, or an approach where you must do X first then Y if using the integration?

Drupal 9.3.9 with CiviCRM 5.48

In the composer file (I believe as recommended):

"drupal/webform":"^6.2@beta" with "drupal/webform_civicrm": "^6.2.0" and "wikimedia/composer-merge-plugin": "^2.0"

Many thanks

2 Answers 2


OK - it was data related. I had a case type that had an additional role defined but for some reason was not visible on the UI. When I used the API explorer to view all details of the case type, there was an additional 'caseRole' defined, but it was not visible. I have no idea how the data came to be in that state, but I am guessing that when the list of case types is generated on the form, it goes looking for the relationships, cannot find it and this causes the issue.


Our automated testing builds D9 x 5 versions of CiviCRM on every push/PR/merge -> here are the details of the build:


Note automated tests include Existing Contact element lookups. So your D9/CiviCRM set up is either missing something or something is running interference.

Have a good look at that main.yml file to spot any differences with your composer config/set up.

  • Much appreciated- I’ll take a look at my settings and also try from a blank database with test contacts i case it is somehow data related. Everything seems fine data wise in production, but you never know.
    – ChumKui
    Commented Apr 10, 2022 at 19:51
  • Hi Karin - I have made progress, it appears to be data related (worrying...) I did a completely fresh install using demo data and all is fine when I set the form for one case. The moment I use my own data, setting a form to using a single case causes a crash with the same error (Expected one RelationshipType but found 0). I disabled all my own case types and enabled Housing Support and it works... I'll keep digging
    – ChumKui
    Commented Apr 11, 2022 at 14:48
  • Tracked it down to one particular case type, if it is enabled, setting the the number of Cases from 0 on the form to 1 causes nothing to be displayed (normally you get the drop down of Case types to choose from) and an error in the logs of 'CiviCRM_API3_Exception: Expected one RelationshipType but found 0 in civicrm_api3() (line 135 of /var/www/html/vendor/civicrm/civicrm-core/api/api.php).' Saving and using the form will cause a crash. Any ideas greatly appreciated!
    – ChumKui
    Commented Apr 11, 2022 at 15:43
  • Ah ok - good work! So is this Case Type a custom one? I checked our automated tests for Case Type we’re just using a native one (Housing Support) at this point -> github.com/colemanw/webform_civicrm/blob/6.x/tests/src/… Commented Apr 11, 2022 at 18:40
  • Yes it is a custom case and clearly the data has been corrupted in some way. That’s a job for this week (…) but the main thing is I can continue the build in D9 and learn the new webform. Thanks for providing us all with a fabulous module, I’m looking forward to seeing what more we can do with it.
    – ChumKui
    Commented Apr 11, 2022 at 20:06

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