Title: Foreign key error
Last modified: February 15, 2018

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# Foreign key error

 *  Resolved [voicefeed](https://wordpress.org/support/users/voicefeed/)
 * (@voicefeed)
 * [8 years, 1 month ago](https://wordpress.org/support/topic/foreign-key-error/)
 * Hi – we’re testing out a plugin called “[ProfileGrid](https://wordpress.org/plugins/profilegrid-user-profiles-groups-and-communities/)”
   and NS Cloner is throwing the following error when it’s active:
 * “Uh-oh – there was an sql error: Cannot delete or update a parent row: a foreign
   key constraint fails.”
 * Looking in the PHP error log, we also see this error, with more details:
 * WordPress database error Cannot delete or update a parent row: a foreign key 
   constraint fails for query DROP TABLE IF EXISTS`wp_40_promag_msg_threads` made
   by require_once(‘wp-admin/admin.php’), do_action(‘admin_init’), WP_Hook->do_action,
   WP_Hook->apply_filters, ns_cloner->admin_init, ns_cloner->process_init, ns_cloner-
   >process, ns_cloner->clone_tables
    -  This topic was modified 8 years, 1 month ago by [voicefeed](https://wordpress.org/support/users/voicefeed/).

Viewing 1 replies (of 1 total)

 *  Plugin Author [Never Settle](https://wordpress.org/support/users/neversettle/)
 * (@neversettle)
 * [8 years, 1 month ago](https://wordpress.org/support/topic/foreign-key-error/#post-9979725)
 * That is a problem with how the other plugin installs it’s own tables and foreign
   key constraints. The best option is to manually remove the FK constraint(s) and
   try again.
 * Regards,
    NS

Viewing 1 replies (of 1 total)

The topic ‘Foreign key error’ is closed to new replies.

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## Tags

 * [foreign key](https://wordpress.org/support/topic-tag/foreign-key/)

 * 1 reply
 * 2 participants
 * Last reply from: [Never Settle](https://wordpress.org/support/users/neversettle/)
 * Last activity: [8 years, 1 month ago](https://wordpress.org/support/topic/foreign-key-error/#post-9979725)
 * Status: resolved