The German actress was auctioning off the Segway and decided to show bidders how it worked as Stone sought cash for the item.
But she lost control of the two-wheeler and feared it would knock an oblivious Stone off the stage.
Kruger tells the Globe, "I was wearing really high heels, was totally off balance - and I nearly killed Sharon Stone.
"I ran over the train of her dress, and she stumbled and almost fell off the stage. I could see the headlines: 'Diane Kruger kills Sharon Stone'."