Error handling in php functions without crashes

i want to handle an error in my php function without crashing my whole script first it pushes this error Notice: Trying to get property of non-object in

E:\amir\1magazine\tools\xampp\htdocs\CairoHash\assests\plugins\content_handling.php on line 74

i know what is the error for but i want to continue without crashing my script

i tried IF functions it didn't work as i hoped