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DB Error: constraint violation

Database Error Code: Cannot add or update a child row: a foreign key constraint fails (`tfguild_civicrm/civicrm_log`, CONSTRAINT `FK_civicrm_log_modified_id` FOREIGN KEY (`modified_id`) REFERENCES `civicrm_contact` (`id`) ON DELETE CASCADE), 1452

One site it while updating the intro text to an event
The other site was just adding a new user.

Any thoughts on what causes an foreign key error?


----here is more output---
Array
(
    [callback] => Array
        (
           

• => CRM_Core_Error
[1] => handle
        )

   

=> -3
    [message] => DB Error: constraint violation
    [mode] => 16
    [debug_info] => INSERT INTO civicrm_log (entity_table , entity_id , data , modified_id , modified_date ) VALUES ('civicrm_contact' ,  351 , 'civicrm_contact,351' ,  180 ,  20100202142117 )  [nativecode=1452 ** Cannot add or update a child row: a foreign key constraint fails (`tfguild_civicrm/civicrm_log`, CONSTRAINT `FK_civicrm_log_modified_id` FOREIGN KEY (`modified_id`) REFERENCES `civicrm_contact` (`id`) ON DELETE CASCADE)]
    [type] => DB_Error
    [user_info] => INSERT INTO civicrm_log (entity_table , entity_id , data , modified_id , modified_date ) VALUES ('civicrm_contact' ,  351 , 'civicrm_contact,351' ,  180 ,  20100202142117 )  [nativecode=1452 ** Cannot add or update a child row: a foreign key constraint fails (`tfguild_civicrm/civicrm_log`, CONSTRAINT `FK_civicrm_log_modified_id` FOREIGN KEY (`modified_id`) REFERENCES `civicrm_contact` (`id`) ON DELETE CASCADE)]
    [to_string] => [db_error: message="DB Error: constraint violation" code=-3 mode=callback callback=CRM_Core_Error::handle prefix="" info="INSERT INTO civicrm_log (entity_table , entity_id , data , modified_id , modified_date ) VALUES ('civicrm_contact' ,  351 , 'civicrm_contact,351' ,  180 ,  20100202142117 )  [nativecode=1452 ** Cannot add or update a child row: a foreign key constraint fails (`tfguild_civicrm/civicrm_log`, CONSTRAINT `FK_civicrm_log_modified_id` FOREIGN KEY (`modified_id`) REFERENCES `civicrm_contact` (`id`) ON DELETE CASCADE)]"]
)