Virtualmin roundcube password Drivers not work with error

Operating system:Debian
OS version:Jessie

I use identifiers in the form username@domain
when I validate the password change I get the following error:
No user named "" was found in the server ""
The problem is that if I integrate a code of this type:
$username = escapeshellcmd(str_replace('-'.$domain, '@'.$domain, $username));
my error becomes:
No user named "" was found in the server ""
I’m using the latest online version of the virtualmin drivers and Roundcube version: 1.4.11
could you try to help me?
I will be grateful to you !

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