go to
/wp-content/plugins/buddypress-groups-extras/bpge.php
and on line 106
change
if ( $bp->current_component == bp_get_groups_root_slug() && $bp->is_single_item && in_array($bp->groups->current_group->id, $bpge['groups'])){
to
if ( $bp->current_component == bp_get_groups_root_slug() && $bp->is_single_item && in_array($bp->groups->current_group->id, (array)$bpge['groups'])){
this worked for me and STILL allows you to use private & hidden groups.
( my fix forces in_array to recognize $bpge[‘group’] as an array and not complain that it cant determine the data type )
