Go to the BP_CGGControllerComponent and create a new function called UpdateGroupLeader.

Add a new function input called NewLeader and set its type to String.

Create a new local variable called IndexL and set its type to Integer.

Create a new local variable called GroupMemberL and set its type to S_GroupMember.

Add the highlighted nodes shown in the image below, location at the top of the image.

Add the highlighted nodes shown in the image below, location at the top of the image.

You may need to delete the current save for this fix to work correctly. To do this drag the BP_SaveHelper blueprint into your level and in the Details panel click the Delete CGG Save button.