When trying to do get:
2020-04-28 16:20:15.736 [54892] main/119/server/127.0.0.1:42002 D> ClientError at /build/usr/src/debug/tarantool-2.2.3.1/src/box/txn.c:788
It is ER_NO_TRANSACTION.
Before splitting transaction and fiber memory regions, box_txn_alloc() may be called w/o active transaction.
Reported by Andrey Yanda.