Code Igniter 2 Libraries Email got error - php

Question

Good Evening,
I'm using CodeIgniter 2 on IIS 8.5 and MSSQL Server,
When i tried to send an email in the process, it shows the error:
Severity: Notice
Message: A non well formed numeric value encountered
Filename: libraries/Email.php
Line Number: 1689
I've been using this code for some projects in the same server, and it's working properly. But when i tried to implement on this one it always shows this error everytime there's sending email process.
And here's my controller:
function reset_pass() {
if (!IS_AJAX) {
display_nonajax_stop();
exit;
} else {
$settings = $this->m_setting->get_setting_array();
$min_pass_length = (int) $settings["acc_pass_min_length"];
$data = $this->input->post();
$id = $data['id'];
$hasil = array();
$kondisi = array(
"usr_id" => $id
);
$current_time = waktu_sekarang();
$baris = $this->m_ess->get_user_employee_row($kondisi);
$user = $baris;
if ($user->usr_email === NULL) {
$hasil['pesan'] = "User does not have valid email associated . Please contact Administrator.";
$hasil['status'] = 0;
} else {
$this->load->helper('email');
if (!valid_email($user->usr_email)) {
$hasil['pesan'] = "User does not have valid email associated . Please contact Administrator.";
$hasil['status'] = 0;
} else {
$hasil['pesan'] = "Username and email is ok";
$hasil['status'] = 0;
$this->load->library('rndconditionpass');
$tmppass = $this->rndconditionpass->get_random_string($min_pass_length);
$new_password = $this->bcrypt->do_hash($tmppass);
$mail_data['random'] = $tmppass;
$mail_data['username'] = $user->usr_name;
$mail_data['full_name'] = $user->emp_name;
$mail_data['password'] = $tmppass;
//prepare data to be used in leo_mail library
$param = array();
$param['recipient'] = $user->usr_email;
$param['content'] = $this->load->view("template/mail/mail_reset_pass", $mail_data, TRUE);
$param['subject'] = "Reset Password";
$this->load->library('leo_mail');
$kirim = $this->leo_mail->kirim($param);
if ($kirim['status'] == 1) {
#password history
$insert_pass = array(
"pas_usr_name" => $user->usr_name,
"pas_password" => $new_password,
"pas_date" => $current_time,
"pas_opid" => $this->session->userdata("usr_name"),
"pas_update" => $current_time
);
$this->m_pass->insert_pass($insert_pass);
$hasil['pesan'] = "Password has been reset and user has been notified via email. ";
$hasil['status'] = 1;
//update the database, store the reset code
$update = array();
$update['usr_last_cpass'] = date("Y-m-d H:i:s");
$update['usr_needchgpwd'] = "Y";
$update["usr_password"] = $new_password;
$kondisi = array("usr_name" => $user->usr_name);
$q = $this->m_ess->update_user($update, $kondisi);
} else {
$hasil['pesan'] = "Fail to send email your password reset code.";
$hasil['status'] = 0;
}
}
}
echo json_encode($hasil);
}
}
and here's the '$this->leo_mail->kirim function
function kirim($param) {
$q=$this->ci->m_smtp->get_mail_konfig();
$hasil=array();
if($q->num_rows()<1) {
$hasil['pesan']="Your SMTP configuration has not been set up properly";
$hasil['status']=0;
} else {
if(valid_email($param['recipient'])) {
$config=array();
$config_data= $q->row();
$config['protocol'] = "smtp";
$config['useragent'] = "HRISSMTPLIB";
$config['smtp_port'] = $config_data->smt_smtp_port;
$config['smtp_host'] = $config_data->smt_smtp_host;
$config['smtp_user']= $config_data->smt_smtp_user;
$config['smtp_pass']= $this->ci->leo_enkripsi->decrypt($config_data->smt_smtp_pass,$this->key);
$config['newline']="\r\n";
$config['wordwrap'] = FALSE;
$config['starttls']=($config_data->smt_encrypt_type==3)?TRUE:FALSE;
$config['mailtype'] = "html";
$this->ci->email->initialize($config);
$this->ci->email->from($config_data->smt_email,$config_data->smt_name);
$this->ci->email->to($param['recipient']);
$this->ci->email->subject($param['subject']);
$this->ci->email->message($param['content']);
if($this->ci->email->send()) {
$hasil['pesan']="Email sent";
$hasil['status']=1;
} else {
$hasil['pesan']= $this->ci->email->print_debugger();
$hasil['status']=0;
}
} else {
$hasil['pesan']="Recipient email is not valid";
$hasil['status']=0;
}
}
return $hasil;
}
Sorry for my bad english.
Thank you in advance.