Not sure what causes this. It might be deleting a task when it is scheduled or in process of running. Can not pinpoint the root cause.
See attachment image of log file results showing "Error Updating Task Row: Object Reference not set..."
There is no JobId reference or task Reference to know what is triggering these errors.
The only way I have found to stop these runaway/rogue errors is to restart the VisualCron service on the server.
Is this a known bug?