(CNN) — Country singer Tim McGraw had to cut short his set when he collapsed on stage due to dehydration at a show in Dublin, Ireland, over the weekend.

McGraw had just finished his song “Humble and Kind” at the “Country to Country” festival Sunday when he slumped to his knees.

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After about 20 minutes, McGraw’s wife, fellow country star Faith Hill, went on stage to inform concertgoers what happened.

“He’s been super dehydrated and I apologize,” she said. “But I made the decision that he cannot come back out onstage.”

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Hill, who’s touring alongside her husband, said, “We’ve all been a little bit dehydrated, traveling so much.”

Dublin was one of the three stops on the Country to Country festival.

McGraw and Hill will begin a 29-city US tour in Richmond, Virginia, on May 31.

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