How to fix a Num_row error

Hey!!

Im trying to fix an error assciated with this code (  if($result->num_rows > 0);{

                while($row = $result->fetch_assoc()){
                    $data[] = $row;

                }
            }
        }
        return !empty($data)?$data:false;
    }
   

):

The error is:
A PHP Error was encountered

Severity: Notice
Message: Trying to get property of non-object
Filename: views/DB.class.php
Line Number: 72



How do I fix this, Ive been wrecking my brain trying to figure this out  



,
Mekaboo