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From the error logs:
[14-Oct-2016 21:06:38 UTC] PHP Fatal error: Call to undefined function WP_Stream\mb_strtolower() in /home/xxxxxxx/public_html/xxxxxxx/wp-content/plugins/stream/connectors/class-connector-comments.php on line 603
[14-Oct-2016 21:39:12 UTC] PHP Fatal error: Call to undefined function WP_Stream\mb_strtolower() in /home/xxxxxxx/public_html/xxxxxxx/wp-content/plugins/stream/connectors/class-connector-comments.php on line 270