[@robin-w Moderator 9 years, 3 months ago]

Suspect you are using php 7.1
so 3 fixes
1. downgrade to a lesser version of php
2. upgrade to bbpress 2.6beta-2
3. in bbpress 2.5.12 change line 1851 from
$meta_query = $posts_query->get( ‘meta_query’ );
to
$meta_query = $posts_query->get( ‘meta_query’, array() );
Since the next upgrade will fix that anyway, no issue in changing the bbpress file
best I can offer I’m afraid