The New York Stock Exchange said on Wednesday that a sell short restriction (SSR) was “erroneously” triggered in a set of ticker symbols for companies listed on the exchange on Tuesday that led to a glitch at market open.

The glitch prevented the opening auctions for a slew of stocks, prompting widespread trading halts, confusion over whether orders were being filled at correct prices and trades in more than 250 securities being busted.

The SSR is a process aimed at limiting short selling. The goal is to prevent short sellers from pushing the shares of a company lower.

Some NYSE-listed stocks briefly halted for trading after market open

The SSR will be deactivated prior to the NYSE opening on Wednesday, the company said.