Duplicate Server Error

I have see very much error the lst Days.

Its a Bug ?

Code:
Zend_Db_Statement_Mysqli_Exception: Mysqli statement execute error : Duplicate entry '648897-72127' for key 'PRIMARY' - library/Zend/Db/Statement/Mysqli.php:214
Generiert durch: classicda, Heute um 02:47 Uhr
Stapelverfolgung

#0 /var/www/deb/library/Zend/Db/Statement.php(297): Zend_Db_Statement_Mysqli->_execute(Array)
#1 /var/www/deb/library/Zend/Db/Adapter/Abstract.php(479): Zend_Db_Statement->execute(Array)
#2 /var/www/deb/library/Zend/Db/Adapter/Abstract.php(574): Zend_Db_Adapter_Abstract->query('INSERT INTO `xf...', Array)
#3 /var/www/deb/library/XenForo/DataWriter.php(1638): Zend_Db_Adapter_Abstract->insert('xf_user_follow', Array)
#4 /var/www/deb/library/XenForo/DataWriter.php(1627): XenForo_DataWriter->_insert()
#5 /var/www/deb/library/XenForo/DataWriter.php(1419): XenForo_DataWriter->_save()
#6 /var/www/deb/library/XenForo/Model/User.php(1794): XenForo_DataWriter->save()
#7 /var/www/deb/library/XenForo/ControllerPublic/Member.php(505): XenForo_Model_User->follow(Array)
#8 /var/www/deb/library/XenForo/FrontController.php(351): XenForo_ControllerPublic_Member->actionFollow()
#9 /var/www/deb/library/XenForo/FrontController.php(134): XenForo_FrontController->dispatch(Object(XenForo_RouteMatch))
#10 /var/www/deb/index.php(13): XenForo_FrontController->run()
#11 {main}

Benötigter Status

array(3) {
  ["url"] => string(134) "http://www.mysite.com/members/user1234.72127/follow?_xfToken=648897%2C1470185239%2Cd05ec747b3a9bc032665aff72c6f0ed23d56e29e"
  ["_GET"] => array(2) {
    ["/members/user1234_72127/follow"] => string(0) ""
    ["_xfToken"] => string(58) "648897,1470185239,d05ec747b3a9bc032665aff72c6f0ed23d56e29e"
  }
  ["_POST"] => array(5) {
    ["_xfConfirm"] => string(1) "1"
    ["_xfRequestUri"] => string(11) "/resources/"
    ["_xfNoRedirect"] => string(1) "1"
    ["_xfToken"] => string(8) "********"
    ["_xfResponseType"] => string(4) "json"
  }
}
 
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