Permission denied error when adding EmailRecipient

[mxmclaudel]

When a user who is NOT an administrator attempts to add a new email recipient, they get a Forbidden message. It works fine when a user has the administrator role.
The error is on EmailRecipient->getFormParent(), the $formID retrieved from the session is a Page but is expecting to have a UserDefinedForm.
This does not cause problem for a user defined form page, just for a page, with a userform element.

The full error is:

ERROR [UNKNOWN TYPE, ERRNO 403]:
IN GET /admin/pages/edit/EditForm/1135/field/ElementalArea/item/2332/ItemEditForm/field/EmailRecipients/item/new
Line in

Trace
SilverStripe\Dev\CliDebugView->renderTrace()
DetailedErrorFormatter.php:119

SilverStripe\Logging\DetailedErrorFormatter->output(403, , , , )
DetailedErrorFormatter.php:54

SilverStripe\Logging\DetailedErrorFormatter->format(Array)
HTTPResponse.php:416

SilverStripe\Control\HTTPResponse->outputBody()
HTTPResponse.php:344

SilverStripe\Control\HTTPResponse->output()
index.php:26