phpBB Debug/PHP Warning in viewtopic when a post has been edited by a user that no longer exists 

Error message received 

[phpBB Debug] PHP Warning: in file [ROOT]/viewtopic.php on line 1823: Undefined array key 7 [phpBB Debug] PHP Warning: in file [ROOT]/viewtopic.php on line 1833: Trying to access array offset on value of type null [phpBB Debug] PHP Warning: in file [ROOT]/viewtopic.php on line 1833: Trying to access array offset on value of type null

Turning off

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Link to post discussion

https://www.phpbb.com/community/viewtopic.php?t=2633416