DraftKings Inc said on Monday login information of some customers was compromised on other websites.

DraftKings said it had identified less than $300,000 of customer funds that were affected, adding, “we intend to make whole any customer that was impacted.”

“DraftKings is aware that some customers are experiencing irregular activity with their accounts. We currently believe that the login information of these customers was compromised on other websites and then used to access their DraftKings accounts where they used the same login information,” Paul Liberman, DraftKings’ co-founder and president for global technology and product said in a statement.

Shares of the company fell nearly 5%. DraftKings in a tweet added it has not seen any evidence that would suggest the company’s systems were breached to obtain information.