Templates with Output Variables

I have the following Template that I am trying to use.
However I keep getting the following error: Cannot assign a Vector value to a Scalar variable.

##AH:UseTextMode
template SQL-ScalarQuery<$ConnectionString, $CommandText, out $Result>
{
    set $Script = >>
        `$c = `$null;
        `$command = `$null;
        TRY {
            `$c = New-Object System.Data.SqlClient.SqlConnection
            `$c.ConnectionString = $ConnectionString
            `$c.Open();
            `$command = `$c.CreateCommand();
            `$command.CommandText = `$CommandText;
            `$Result = `$command.ExecuteScalar();

            if (`$Result -ne `$null)
            {
                return `$Result.ToString();
            }
            else
            {
                return "";
            }
        }
        FINALLY {
            `$c.Dispose();
            `$command.Dispose();
        }
    >>;

    set $Result = $PSEval($Script);
}

Sample of me trying to use this template:

set $IsSysAdmin = "";
call SQL-ScalarQuery(
    ConnectionString: $SQLServerConnectionString,
    CommandText: >>
        SELECT CAST(IS_SRVROLEMEMBER('sysadmin') as INT)
    >>,
    Result: $IsSysAdmin
);

if $IsSysAdmin == "0"
{
    error;
    Log-Error The user running the Otter Agent must be sysadmin on the local sql server;
}

Screenshot of the error

Thanks, we've identified this as a bug with template variable processing, and will have this fixed in the next version of Otter (coming in a day or two).