Title: 500 error when a user posts a comment
Last modified: October 14, 2016

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# 500 error when a user posts a comment

 *  [Justin Frydman](https://wordpress.org/support/users/defunctlife/)
 * (@defunctlife)
 * [9 years, 8 months ago](https://wordpress.org/support/topic/500-error-when-a-user-posts-a-comment/)
 * 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

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## Tags

 * [500 error](https://wordpress.org/support/topic-tag/500-error/)
 * [Comments](https://wordpress.org/support/topic-tag/comments/)

 * 0 replies
 * 1 participant
 * Last reply from: [Justin Frydman](https://wordpress.org/support/users/defunctlife/)
 * Last activity: [9 years, 8 months ago](https://wordpress.org/support/topic/500-error-when-a-user-posts-a-comment/)
 * Status: not resolved