In a quick, unfortunate turn of events, Wolfmother has canceled its entire European tour due to an unknown illness plaguing lead singer Andrew Stockdale.

A statement from the band was released to the organizers of the Main Square Festival in France reading, “We are sorry to announce that Wolfmother have been forced to cancel its full European tour for June and July. Due to medical reasons, Andrew Stockdale, Wolfmother’s lead singer is unable to fly.”

The tour included sharing the stage with Kiss for a handful of dates in Germany, opening up for Pearl Jam at Hard Rock Calling, and appearances at T In The Park, Rock Am Ring.

The Hives will get a nudge up the bill and Killswitch Engage will be replacing the band at Hard Rock Calling and Download Festival, respectively. Other Euro festivals have not yet named replacements.