Dispatch_Group crash on iPhone 4s/iOS 8 -

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i've written method using dispatch_group : 

class func loadnewevents(incontext context:nsmanagedobjectcontext, completion:(() -> void)?=nil) {     ddlogdebug("loading new events")     let context = coredatamanager.backgroundcontext()     let events = coredatamanager.fetch(event.self, incontext: context)     var earliestevent = events.sort({$0.initialtimestamp.integervalue > $1.initialtimestamp.integervalue}).first      let group = dispatch_group_create()     var loadedevents:[event]?     var failure = false     while (loadedevents == nil || loadedevents!.count != 0) && !failure {         dispatch_group_enter(group);         if let earliesttimestamp = earliestevent?.initialtimestamp.longlongvalue {             let url = afterurl(earliesttimestamp)             getevents(url: url,                 success: { events in                     loadedevents = events                     earliestevent = events.last                     dispatch_group_leave(group)                 },                 failure: {                     failure = true                     dispatch_group_leave(group)                 }             )         } else {             break         }         dispatch_group_wait(group, dispatch_time_forever)     }     ddlogdebug("loaded new events") }

it works great in ios9 simulator , on iphone5s w/ ios9. on iphone 4s ios8 there crash @ end of method :

exc_breakpoint (code=exc_arm_breakpoint, subcode=0xdefe) in _dispatch_semaphore_dispose

any idea cause , how fix ?

i found out problem : did not leave group on break.

to fix called dispatch_group_enter(group) within if let since not needed when i'm not doing async call.


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