To reproduce the issue
select a master-child table with child table (detail) show on the master View while adding the master-child relation.
IMPORTANT - master table must be connected to detail table custom view only (if master is connected to a normal detail table it works, problem with a custom view detail table only)
build
now open the master table link
view any of the listed record on master table which has detail table data available
it shows like this
Fatal error: Call to a member function prepareForBuildPage() on a non-object in H:\wamp\www\test_9_VIEW\output\classes\runnerpage.php on line 5802
this was perfect in v8.1, in v9.0 all the builds till 26631 this problem appears tested server: php- 5.5.12, mysql: 5.6.17