Conservative author Candace Owens has accused Amazon employees of damaging copies of her new book before sending them to customers.

Owens, the controversial commentator and author of the new Blackout: How Black America Can Make Its Second Escape From the Democrat Plantation, leveled the accusation on Twitter, writing, “Dear @amazon. About 1,000 people have written to let me know that your employees appear to be stomping on and in this case, smearing Vaseline on my books before mailing them. I know it must have pained you to ship out all 90,000 copies you had in stock—but this is unacceptable.”

She followed that up with another tweet: “The pettiness will do nothing to thwart sales. Let’s try to get the next 100,000 that I plan to sell out of your warehouse, treated with a bit more respect by the looney lefties packing the product, please.”

Owens’ book, published by Simon and Schuster imprint Threshold Editions, argues that Black Americans should abandon the Democratic Party, which she argues is racist and hostile to the interests of Black voters.

Blackout lays bare the myth that all black people should vote Democrat—and shows why turning to the right will leave them happier, more successful, and more self-sufficient,” the publisher says.

The book is a big hit at Amazon. As of Tuesday afternoon it was the retailer’s No. 3 bestseller.

Michael Schaub is a Texas-based journalist and regular contributor to NPR.