PHP Fatal error: Call to a member function fetch_object() on boolean

Question

I got php fatal error after transfer server with php v5.6.19, before that I had no problem at all with following script

Fetch data from db table:

Answer 1

Update your while loop for that case when you get false from $shop->get_department_list() call

updated while like this check for $depts if any data then get $dept:

while($depts && $dept = $depts->fetch_object()){