MINNEAPOLIS (WCCO) — Fans of Nickelback — prepared to be bummed.

The Canadian rockers have canceled the remaining dates of their North American tour due to a medical emergency.

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Live Nation says singer Chad Kroeger needs surgery after a cyst developed on his voice box.

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Their July 25 concert at Minneapolis’ Target Center is one of the shows on the chopping block.

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For refunds, contact the site of purchase. Fans who bought tickets on AXS.com will automatically receive refunds back to their credit or debit cards.