Weekly digest issue

Today our weekly digest email was sent to all members, but it contained raw PHP warning messages instead of styled links. The output included the following repeated error:

Warning: Undefined variable $linkColor in /data/sites/web/[domain]/wp-content/plugins/fluent-community/app/Views/email/Default/_user_post_content.php on line 47 (and lines 48, 53)

Could you confirm whether this is a known issue and whether a fix is available? In the meantime, is there a recommended workaround?