ios - AVAssetWriterInput appendSampleBuffer crashing -

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i have audiowriterbuffer appending audio sample buffers follows

func captureoutput(captureoutput: avcaptureoutput!, didoutputsamplebuffer samplebuffer: cmsamplebuffer!, fromconnection connection: avcaptureconnection!) {      if cmsamplebufferdataisready(samplebuffer) <= 0 {         return     }      if captureoutput == audiooutput && audiowriterbuffer != nil && audiowriterbuffer.readyformoremediadata == true {         var audiotime = cmsamplebuffergetpresentationtimestamp(samplebuffer)         audiowriterbuffer.appendsamplebuffer(samplebuffer)     } }

it works supposed to. every once in while, crashes following error:

nsarray mutated while being enumerated.

at: 

audiowriterbuffer.appendsamplebuffer(samplebuffer)

i don't understand relevance of that, or how solve it.

any clue?


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