关于sql：Postgresql“没有进行中的事务”

Postgresql “no transaction in progress”

为什么我在COMMIT之后收到"没有正在进行的事务"的警告，即使我已经用START TRANSACTION明确启动了一个事务(与BEGIN一样工作)？对于此特定事务，这将发生90％的时间，但有时提交将成功。我正在使用postgres 9.3。这是postgres日志：

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2014-07-04 21:47:19 EST LOG: statement: START TRANSACTION;
2014-07-04 21:47:19 EST LOG: statement: SET SESSION TRANSACTION ISOLATION LEVEL REPEATABLE READ;
2014-07-04 21:47:19 EST LOG: statement: SET autocommit = 1;
2014-07-04 21:47:19 EST LOG: statement: SET TIME ZONE 'UTC'
2014-07-04 21:47:19 EST LOG: statement: INSERT INTO"Users" (...) VALUES (...) RETURNING *;
2014-07-04 21:47:19 EST LOG: statement: INSERT INTO"Profiles" (...) RETURNING *;
2014-07-04 21:47:19 EST LOG: statement: SET TIME ZONE 'UTC'
2014-07-04 21:47:19 EST LOG: statement: INSERT INTO"Sessions" (...) VALUES (...) RETURNING *;
2014-07-04 21:47:20 EST LOG: statement: COMMIT;
2014-07-04 21:47:20 EST WARNING: there IS no TRANSACTION IN progress