Plugin Conflict with BP_Groups_Hierarchy

Hello,

I’ve noticed the following log notice;

[01-Feb-2016 22:50:59 UTC] PHP Notice: Indirect modification of overloaded property BP_Groups_Hierarchy::$extras has no effect in /home/ljlee/public_html/wp-content/plugins/buddypress-groups-extras/core/loader.php on line 68

This seems to be a conflict introduced when both Buddypress Group Extras and BP Group Hierarchy is installed;
https://en-ca.ww.wp.xz.cn/plugins/bp-group-hierarchy/

Thoughts appreciated,
Thanks

https://ww.wp.xz.cn/plugins/buddypress-groups-extras/