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Customers who went to certain Wendy's hamburger outlets in Michigan should beware of a security breach involving credit cards between Dec. 2, 2015 and June 8.

A long list of Michigan outlets are impacted by the breach, Susan Tompor writes in the Detroit Free Press.

Four are in Ann Arbor, four in Livonia, four in Jackson, three in Lincoln Park, two in Clinton Township, two in Lansing and one each in Chesterfield, Detroit, Dearborn, East Lansing, Fowlerville, Hillsdale, and Northville. About 50 cities in Michigan are listed here.

The Freep reports:

The Michigan Credit Union League, its member credit unions and the Credit Union National Association said they are advocating for stronger accountability for merchants and card network companies after a data breach at Wendy’s forced a number of Michigan credit unions to cover the associated costs. The national credit union association announced it was joining a data-breach lawsuit against the restaurant chain.

Read more: Detroit Free Press