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Hello @proleadersacademy,
I was unable to recreate the issue myself and at this point I can not confirm if the PHP warnings are caused by the new SiteGround Optimizer version.
I would advise you to submit a ticket in your SiteGround account for further investigation. The Technical Support team will be able to identify if the issue is related to SiteGround Optimizer, and if so, they will notify the developers of the plugin.
Best Regards,
Kuzman Stoyanov