Substring Length Error

SubstringLengthError.ps1

#... get some results to work with...
$sqlcmdParams = @{
    ServerInstance = 'localhost\SQLSERVER2K16'
    Database       = 'master'
    Query          = @'
        SELECT TOP(10) 
                name
        FROM    dbo.spt_values 
        WHERE   name IS NOT NULL
          AND   LEN(name) != 0
        ORDER BY name;
'@        
};
$dbResults = Invoke-Sqlcmd @sqlcmdParams;

#...now check the substring function...
foreach ($row in ($dbResults.name)) {
    [PSCustomObject]@{
        RowName = $row
        RowSubString = $row.Substring(5, 100)
    };
};

<#
#   Error message:
#       Exception calling "Substring" with "2" argument(s): "startIndex cannot be larger than length of string"
#>