Trader Joe’s, the second best supermarket chain in the U.S. (according to Consumer Reports), is recalling raw walnuts sold under its own  brand because of  potential salmonella contamination. The recalled walnut varieiies are the company’s store brand of Raw Halves & Pieces, Raw Pieces, Baking Pieces, Organic Raw Halves & Pieces and Raw Premium Walnut Halves.

A company employed by the U.S. Food and Drug Administration (FDA) detected salmonella during routine testing and the recall was ordered. The walnuts in question have “best buy” dates between October 15 and December 1, 2015. The company lists the lot numbers in the recall announcement. The FDA says the nuts were delivered for sale to Trader Joe’s stores nationwide.

The company says that, thus far, it has received no complaints of illness as related to the recalled nuts. It says its pulling of product from shelves is due to “an abundance of caution.” Until the FDA completes its investigation, the sale of walnuts in Trader Joe’s has been halted. Customers may return any purchased walnuts for a refund.

As recently as March 12, cinnamon almonds were recalled by Trader Joe’s because the packaged contained peanuts not mentioned on the product label. Peanuts are a common allergen.

One of the largest recalls ever in the U.S., in 2012, was around salmonella-tainted Trader Joe’s (TJ’s) brand peanut butter. TJ’s last year had a spate of recalls, starting with its brand of raw almond butter (due to salmonella) and then stone fruits (nectarines, peaches and plums) and also packaged hummus. The year before, in 2013, prepared wraps and salads were recalled for contamination of E. coli. The company’s butter chicken saw a recall in 2012 for the deadly listeria bacteria, including three tons of barbecued chicken salad. Finally, in 2010, cilantro tainted by salmonella affected several of the company’s products.