Millions of dollars' worth of ether, the digital token of the ethereum blockchain, could be frozen on a cryptocurrency wallet because one individual "accidentally" triggered a bug.

Parity, a cryptocurrency wallet provider, said in a security alert Tuesday that it had discovered a "vulnerability" in its wallet that allowed users to change code and become the owners of wallets that didn't belong to them.

The company said that one person "suicided" the wallet, deleting its code and freezing all ether tokens contained within. Users are now unable to move funds out of the wallet.

Each ether token is currently worth roughly $300, according to data from CoinDesk. They are popularly used to buy new coins in the controversial practice of "initial coin offerings" (ICOs), a method for cryptocurrency start-ups to raise funds.

Read more in CNBC.