Leaderboard error

DELETE FROM `core_reputation_leaderboard_history` WHERE leader_position > 0 and leader_date BETWEEN IS NULL and -4
IPS\Db\Exception: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'IS NULL and ?' at line 1 (1064)
#0 /home3/eterniag/public_html/system/Db/Db.php(1074): IPS\_Db->preparedQuery('/*IPS\\core\\task...', Array)
#1 /home3/eterniag/public_html/applications/core/tasks/leaderboard.php(89): IPS\_Db->delete('core_reputation...', Array)
#2 /home3/eterniag/public_html/system/Task/Task.php(248): IPS\core\tasks\_leaderboard->execute()
#3 /home3/eterniag/public_html/applications/core/modules/admin/settings/advanced.php(589): IPS\_Task->run()
#4 /home3/eterniag/public_html/system/Dispatcher/Controller.php(85): IPS\core\modules\admin\settings\_advanced->runTask()
#5 /home3/eterniag/public_html/applications/core/modules/admin/settings/advanced.php(34): IPS\Dispatcher\_Controller->execute()
#6 /home3/eterniag/public_html/system/Dispatcher/Dispatcher.php(146): IPS\core\modules\admin\settings\_advanced->execute()
#7 /home3/eterniag/public_html/admin/index.php(13): IPS\_Dispatcher->run()
#8 {main}