The so-called DAO hack is not the only example. In July 2017 an attacker was able to divert the equivalent of about USD 30 million from multiple addresses, all of which contained the same code of the company Parity. The security information of Parity is now no longer online and is now accessible only via archives.
A short time later, there was again a severe error in the code of Parity, which led an inexperienced user to accidentally trigger the self-destruction of a contract. As a result, ethers valued at about USD 360 million disappeared in digital nirvana, with no prospect of recovery. Because of the exorbitant sum of money, there was a discussion of whether the momentous transaction, similar to the DAO hack, should be undone by a fork. In the end, this proposal was rejected.