In palm_handle_discard, when palm_handle_verify_page encounters an error, the current error-handling rolls back the transaction twice: once in the err section of palm_handle_verify_page, and then again in palm_handle_discard after the error is returned via PALM_KV_ERR(palm, session, palm_handle_verify_page(plh, session, page_id, lsn)). This double rollback leads to the assertion failure Assertion 'context->lmdb_txn != NULL' failed, since the transaction has already been rolled back. This ticket aims to redesign the error-handling flow to ensure that palm_kv_rollback_transaction is only called once, preventing this assertion error.