getting non-object error only in log file

hi, I'm trying to get my record from DB in an object and echo in the view page.
I did this before and worked but this time I'm getting a weird error only in the log file NOT on the view page. also, the result is showing on the view page perfectly!

I wanna fix the error from my log file

Model:

PHP Code:

function get_one_by($cond=array()){
    $result = $this->db->get_where($tablename, $cond);
    if ( $result->num_rows() > 0 ){
        return $result->row();
    }
    return FALSE;
} 


Controller:

PHP Code:

$data['theForm'] = $this->form->get_one_by(array('URL' => $url));
$this->load->view('theForm', $data); 


View:

PHP Code:

echo heading($theForm->TITLE, 2); 


View Result:

Code:

<h2>a form</h2>

Log:

Code:

ERROR - 2017-09-10 11:39:34 --> Severity: Notice --> Trying to get property of non-object /Applications/XAMPP/xamppfiles/htdocs/xx/xx.php 7

Thanks for any help