How to hide mybb warning messages from public?

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when we do a template mistake or if any file or table gets deleted or mysql/database dont get connected or anything mischief thing happens, we usually get mybb warning messages in big huge boxes as

Code:

MyBB Error Cant connect to mysql/Too many connections.

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Now my question is, why it must be displayed to public?? is there anyway to display a different custom text message [Site in under maintenance] or image or if possible, completely hide those error messages and just email those errors to our mail id.