Warning: Invalid argument supplied for foreach() in mailchimp_update_local_cache()

I have tihs issue as well .. any solutions?

We turned on batch processing for www.drupal.org, and started running into this with a mailchimp_lists field, running 7.x-5.1.

This causes the interests to not properly cache, so they all appear cleared if you go back to the form, until cron runs.

The data I’m seeing come through to $args['interests'] is

Array
(
    [22e1b642b7] => 1
    [a0d7a1c02b] => 1
    [dc0ad3fd6d] => 1
    [3374b1dd84] => 
    [53d7f4209a] => 
    [faceb9a270] => 
    …
)

So I’m using PHP’s loose comparison, if ($interests). Otherwise this is the same as zuernBernhard’s patch, with minor code style cleanup.

#2838871: "Invalid argument supplied for foreach() in mailchimp_lists_process_subscribe_form_choices()" error prevents interest group subscriptions/updates currently has the same patch.

This issue is a duplicate of https://www.drupal.org/project/mailchimp/issues/2838871. Contributors here have been credited.

Reopening since the fix in #2838871-25: "Invalid argument supplied for foreach() in mailchimp_lists_process_subscribe_form_choices()" error prevents interest group subscriptions/updates didn’t look quite right.

This updates the if condition to match the patch in this issue. $interest_group is an array key which will never be itself an array. is_array($interests) should be the right thing to be checking.

Thanks @drumm, LGTM.