Aggregates in insert/upsert into select returns error

Build couchbase-server-1006.5.1-1125 contains query commit 5a4e41c with commit message:
. Fix issue with aggregation in INSERT/UPSERT INTO SELECT

Build couchbase-server-1006.5.1-1125 contains query commit 579c645 with commit message:
. Update test for new decade

Build couchbase-server-1006.5.1-1125 contains query commit 0f29818 with commit message:
. Update decade

verified in 7.0.0-1432 , 6.5.1-6240 closing out, tested sum, min,max,avg

Nevermind I understand now, I was attempting to do this insert on an empty bucket, so

SELECT SUM(1) AS doc FROM default;

returns null, hence it inserts an empty document. There is no issue