On my staging site: http://floridafunctionalmedicine.wordpresswebsitedesigns.org/ I installed Bbpress and get this error below (for example on page http://floridafunctionalmedicine.wordpresswebsitedesigns.org/forums/forum/forum/). Theme and wordpress are updated to newest versions and i deactivated all plugins and still get error. bbPress is Version 2.5.13
Fatal error: Uncaught Error: [] operator not supported for strings in /home/beachcan/public_html/floridafunctionalmedicine.wordpresswebsitedesigns/wp-content/plugins/bbpress/includes/forums/functions.php:1800 Stack trace: #0 /home/beachcan/public_html/floridafunctionalmedicine.wordpresswebsitedesigns/wp-includes/class-wp-hook.php(298): bbp_pre_get_posts_normalize_forum_visibility(Object(WP_Query)) #1 /home/beachcan/public_html/floridafunctionalmedicine.wordpresswebsitedesigns/wp-includes/class-wp-hook.php(323): WP_Hook->apply_filters(’’, Array) #2 /home/beachcan/public_html/floridafunctionalmedicine.wordpresswebsitedesigns/wp-includes/plugin.php(515): WP_Hook->do_action(Array) #3 /home/beachcan/public_html/floridafunctionalmedicine.wordpresswebsitedesigns/wp-includes/class-wp-query.php(1683): do_action_ref_array(‘pre_get_posts’, Array) #4 /home/beachcan/public_html/floridafunctionalmedicine.wordpresswebsitedesigns/wp-includes/class-wp-query.php(3248): WP_Query->get_posts() #5 /home/beachcan/public_html/floridafunctionalme in /home/beachcan/public_html/floridafunctionalmedicine.wordpresswebsitedesigns/wp-content/plugins/bbpress/includes/forums/functions.php on line 1800