_mailchimp_lists_subscription_has_changed() uses the output of MailchimpListsSubscription::getInterestGroups() unconditionally as input for a foreach loop. MailchimpListsSubscription::getInterestGroups() however does not always return an array.
MailchimpListsSubscription::getInterestGroups() can sometimes return NULL, and 🐛 MailchimpListsSubscription::getInterestGroups() should always return an array Fixed provides a patch for this. However, as mentioned in #3357696-4: New interest groups can be NULL → , it can sometimes return FALSE, and the patch in 🐛 MailchimpListsSubscription::getInterestGroups() should always return an array Fixed does not protect against this.
I dont know how to reproduce this from scratch. It may be related to situations where no interest groups have been defined.
Modify the definition of MailchimpListsSubscription::getInterestGroups() so that it can ONLY return an array, along the following lines:
public function getInterestGroups() {
$interest_groups = $this->values['interest_groups'];
if (!is_array($interest_groups)) {
$interest_groups = [];
}
return $interest_groups;
}Create a patch with the above fix.
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Closed: duplicate
2.2
Lists Module
This shows the changes I made on top of https://www.drupal.org/files/issues/2021-07-15/3194699-6.patch →