An Iowa company is recalling the cookie dough it sold to other companies because it may be contaminated with listeria bacteria.

Aspen Hills notified customers about the recall on Sunday, but it wasn’t immediately clear whether any of the cookie dough had reached consumers because the Garner, Iowa, based company doesn’t sell directly to consumers.

Aspen Hills’ cookie dough was implicated in last month’s recall of Blue Bell ice cream. Aspen Hills spokesman Jon Austin says no illnesses have been linked to the company’s products and none have tested positive for listeria.

Austin says the cookie dough was recalled because the company found lapses in its food safety system — such as inadequate documentation and failure to wear proper uniforms — that could have allowed the product to become contaminated.