dovecot - Sep 2014 - Assertion failed in sql_transaction_commit with pgsql driver

Hi!

Next code from driver_pgsql_transaction_commit cause assertion failed in
do_query function - i_assert(SQL_DB_IS_READY(&db->api))

    } else {
        /* multiple queries, use a transaction */
        ctx->refcount++;
        sql_query(_ctx->db, "BEGIN", transaction_begin_callback,
ctx);               <- first sql_query changes db state to SQL_DB_STATE_BUSY
        while (_ctx->head != NULL) {
            ctx->refcount++;
            sql_query(_ctx->db, _ctx->head->query,                     
<- second query cause assertion failed due to SQL_DB_IS_READY returns false
                  transaction_update_callback, _ctx->head);
            _ctx->head = _ctx->head->next;
        }
        sql_query(_ctx->db, "COMMIT", transaction_commit_callback,
ctx);
    }

Next transaction query should be called after previous is finished and driver
state changed to SQL_DB_STATE_IDLE