Fatal error: Uncaught Error: Call to a member function fetch_array() on bool

The value of $admin_mail is not an array (or array of results). It is returning false probably which is a boolean value.

Your query 'Select * from proxydb' is returning false. Please check if you really have records in the database for the table proxydb OR the the table name is really without wp_ or other prefix defined at the time of table definition?

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