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SUM 41's hotly anticipated farewell tour has been plunged into chaos after Deryck Whibley injured his back.
The band was forced to pull out of six dates after the frontman was ordered to rest by his physician.
The iconic group had promised fans the "best show of their lives" after deciding to retire after 28 years in the business.
Canadian music festival The Jubilee announced that the gig was cancelled after Deryck had suffered a "minor back injury".
Sum 41 has also cancelled headlining spots in other locations across the country, including Quebec City and New Brunswick.
But it's not all bad news, they still have 32 dates left and will be returning to the stage in San Francisco in September.
In December last year, Deryck admitted to GQ that he'd been struggling with health problems and being away from family, which had made touring difficult.
The band announced their final tour in June this year.
Sharing the dates on X, the band wrote: "Final UK & EU Tour Of The Setting Sum dates just announced for this fall! Our fans overseas have been incredible to us over the years, so we can't wait to put on the best show of our lives and go out on a high."
They announced that they were being supported by The Bronx and Neck Deep.
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Their final gig in Paris was sold out to 35,000 people shortly after.
This comes after the band announced they were splitting up in May last year.
In a post on Instagram they announced plans to go separate ways after 28 years.
"Being in Sum 41 since 1996 brought us some of the best moments of our lives. We are forever grateful to our fans both old and new, who have supported us in every way.
"It is hard to articulate the love and respect we have for all of you and we wanted you to hear this from us first.
"Sum 41 will be disbanding. We will still be finishing all of our current upcoming tour dates this year, and we're looking forward to releasing our final album "Heaven :x: Hell," along with a final worldwide headline tour to celebrate.
"For now, we look forward to seeing all of you skumf*** on the road and are excited for what the future will bring for each of us."
The band's current members are frontman Deryck Whibley, Dave Baksh, Jason McCaslin, Tom Thacker and Frank Zummo.
Jon Marshall, Richard Roy and Mark Spicoluk joined for brief periods in the Nineties.
Drummer Steve Jocz left the band with no explanation in 2013, three years after their big comeback.
Deryck accused him of 'bailing' and hinted that there was bad blood between him and the band.
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Speaking to Rolling Stone in 2016 he said: "We don't speak anymore. I have nothing bad to say about him, but I never miss people who bail.
"It’s just something in me since people have been leaving me since before I was born, like my dad. If you’re not here, you don’t exist to me.”