diff --git a/workflow/engine/src/ProcessMaker/Services/Api/Project/TimerEvent.php b/workflow/engine/src/ProcessMaker/Services/Api/Project/TimerEvent.php
index b496097c4..64b0fc472 100644
--- a/workflow/engine/src/ProcessMaker/Services/Api/Project/TimerEvent.php
+++ b/workflow/engine/src/ProcessMaker/Services/Api/Project/TimerEvent.php
@@ -15,7 +15,6 @@ class TimerEvent extends Api
     private $timerEvent;
 
     private $arrayFieldIso8601 = [
-        'tmrevn_next_run_date',
         'tmrevn_last_run_date',
         'tmrevn_last_execution_date'
     ];