event date reached sql error

We run into an error using the Event Date Reached trigger ('You have an error in your SQL syntax')
civirules > CRM > CivirulesCronTrigger > EventDate.php
$dateExpression = "DATE_ADD(`e`.`".$dateField."` INTERVAL ".$offset." ".$unit .")";
Could it be that before INTERVAL a comma is required?

Edited Aug 11, 2019 by magnolia61

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