Count as a window function doesn't work with NULLs

MariaDB [smtp_email_validator]> select count(null) over () from logs where timestamp > now() - interval 1 hour; 

ERROR 1815 (HY000): Internal error: InetStreamSocket::readToMagic: Remote is closed

MariaDB [smtp_email_validator]> show warnings\G

*************************** 1. row ***************************

  Level: Error

   Code: 1815

Message: Internal error: InetStreamSocket::readToMagic: Remote is closed

*************************** 2. row ***************************

  Level: Error

   Code: 1030

Message: Got error 1815 "Unknown error 1815" from storage engine InfiniDB

*************************** 3. row ***************************

  Level: Error

   Code: 1815

Message: Internal error: /data/buildbot/bb-worker/centos7/mariadb-columnstore-engine/dbcon/execplan/clientrotator.cpp: Could not get a connection to a ExeMgr

3 rows in set (0.000 sec)