Meat-free McDonald’s customers are not lovin’ it at the moment.

Recently the fast-food chain had to issue an apology after several customers across the U.K. claimed they found chicken nuggets in their vegetarian meals.

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Earlier this year, McDonald’s made a move to offer more vegetarian options. Among them was a spicy veggie wrap the international brand released in Europe that features red pesto, vegetarian goujon – a deep-fried strip of veggie meat – relish, tomato, lettuce and red onion. However, upon biting into the wrap, customers said they discovered chicken nuggets inside.

Many customers took to Twitter to express their outrage over the meaty mishap.

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In a statement to The Guardian, McDonald’s issued an apology and called the mistake “not acceptable.”

“We would also like to reassure that we have a number of procedures in place to avoid inaccurate orders, and that, after we saw that mistakes were being made, we introduced a number of additional measures in our kitchens and communicated with all stores to reduce inaccuracies quickly and effectively. This action has led to an increase in order accuracy and a reduction in contact from our customers, however we are disappointed that mistakes are still being made,” the statement read.

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McDonald’s has been testing vegetarian options in many of its foreign markets over the past few years.