Hegic's options contract had a typographical error using options.length instead of optionIDs.length, locking user funds after options expired. The developers ignored security audit warnings from Trail of Bits about critical flaws and rushed the contract to mainnet without fixes. Funds were recovered and users were refunded.

Hegic: There are 152.2 ETH (about 28,537 USD) permanently locked in the contract pool of unexercised put / call options. Out of the 19 contracts, 16 are put options (DAI is locked) and 3 are call options (ETH is locked). Hegic said it will process a 100% refund for all involved users.