Cost basis for cash in lieu

I'd bought 100 shares of CHK and after reverse split in April 2020 (reverse stock split, at a ratio of 1-for-200) I got 0 shares and got cash in liue of fractional shares.

 

The 1099 B from the broker shows cost basis as 0. I'm wondering this is incorrect and the original purchase price of 100 shares is the cost basis. Is this right?