Severity: error message: call to a member function result() on boolean

Mau tanya nech saya punya file views dari row 16 seperti berikut:

$i = 1; $total_biaya = 0; foreach ($get->result() as $key) : $total_biaya += $key->biaya;

Dan Controller nys seperti berikut:

$table = "t_order o JOIN t_detail_order do ON (o.id_order = do.id_order) JOIN t_items i ON (do.id_item = i.id_item)"; $data['get'] = $this->app->get_where($table,['o.id_order'=>$this->uri->segment(3)]);

namun selalu error seperti ini :

A PHP Error was encountered Severity: Error Message: Call to a member function result() on boolean Filename: views/….. Line Number: 18

Mohon penerangannya agan2.....