Subscriptions success, but users received failed

[Eugen_Bondarchi]

Hi, 

After Looker updation to 7.4.52 version, we faced a problem that our customers repeatedly getting email about failing schedules with the error:

The scheduled job "[schedule job]"[2363123] failed for email. Please visit your content to view and resolve the error, or contact your Looker administrator if you need further assistance.

Error: Java::JavaSql::SQLTransactionRollbackException: (conn=connection) Deadlock found when trying to get lock; try restarting transaction

But in the Schedule History this is a success execution
 

Is there any explanations for that ?

Thanks,
Eugen