XenForo Error related to unsubscribe email handling when disabled

[Jake B.]

We're getting the following on a XenForo install every time the cron runs:

PHP:

[LIST]
[*]ErrorException: [E_WARNING] Undefined array key "unsubscribeEmailHandling"
[*]src/XF/Cron/EmailUnsubscribe.php:21
[/LIST]
#0 src/XF/Cron/EmailUnsubscribe.php(21): XF::handlePhpError(2, '[E_WARNING] Und...', '/usr/share/ngin...', 21)
#1 src/XF/Cron/EmailUnsubscribe.php(9): XF\Cron\EmailUnsubscribe::canProcessUnsubscribeEmails()
#2 src/XF/Job/Cron.php(37): XF\Cron\EmailUnsubscribe::process(Object(XF\Entity\CronEntry))
#3...

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