Yes there was. I was there, saw the whole thing.
But seriously, 'stealing' may be too harsh a word, yet you can't deny that, without Byron's fragment, Polly Dolly wouldn't have come up the idea for The Vampire. Independent thought was not one of the doctor's strong suits. And naming the villain of his piece 'Lord Ruthven', after Caroline Lamb's take on Byron, could hardly be called a homage--more like a jab at the poet. He'd have good reason to do so, considering Byron's foul treatment of Polidori.