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Version 5.0.3.
There’s a fatal error in bottom of Scanner page, it appears in the textbox of “Send Email When Change Detected” option.
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<b>Fatal error</b>: Uncaught TypeError: htmlspecialchars(): Argument #1 ($string) must be of type string, array given in /wp-content/plugins/all-in-one-wp-security-and-firewall/admin/wp-security-filescan-menu.php:349