Frito-Lay issued a voluntary nationwide recall of certain jars of its Tostitos Avocado Salsa Dips on Friday over concerns that some may contain milk, an undeclared allergen.

 According to a news release from the U.S. Food & Drug Administration, the front of 15-ounce Tostitos Avocado Salsa jars are correctly labeled, but the jar backs are mislabeled with another product’s nutrition information.

Stating that milk was not declared on the label.

The FDA says those with an allergy or severe sensitivity to milk run the risk of a serious or life-threatening allergic reaction if they consume these products.