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While testing on device (Apple Watch) attempting to save an HKWorkout into HealthKit I am adding samples of distance samples, calories, heart rates and vo2Max to the workout. Unfortunately unlike this question I am not getting as detailed as a trace back...as far as I can tell it's crashing on adding a sample but I can't tell which sample it is or why?Code:private func addSamples(toWorkout workout: HKWorkout, from startDate: Date, to endDate: Date, handler: @escaping (Bool, Error?) -> Void) { let vo2MaxSample = HKQuantitySample(type: HKQuantityType.quantityType(forIdentifier: HKQuantityTypeIdentifier.vo2Max)!, quantity: vo2MaxQuantity(), start: startDate, end: endDate) var samples = [HKQuantitySample]() for distanceWalkingRunningSample in distanceWalkingRunningSamples { samples.append(distanceWalkingRunningSample) } for energySample in energySamples { samples.append(energySample) } samples.append(vo2MaxSample) samples.append(contentsOf: heartRateValues) // Add samples to workout healthStore.add(samples, to: workout) { (success: Bool, error: Error?) in if error != nil { print("Adding workout subsamples failed with error: \(String(describing: error))") handler(false, error) } if success { print("Success, samples have been added, workout Saved.") //WorkoutStartDate = \(workout.startDate) WorkoutEndDate = \(workout.endDate) handler(true, nil) } else { print("Adding workout subsamples failed no error reported") handler(false, nil) } } }Trace:Exception Type: EXC_CRASH (SIGABRT) Exception Codes: 0x0000000000000000, 0x0000000000000000 Exception Note: EXC_CORPSE_NOTIFY Triggered by Thread: 0 Application Specific Information: abort() called Filtered syslog: None found Last Exception Backtrace: 0 CoreFoundation 0x1bdf75e8 __exceptionPreprocess + 124 1 libobjc.A.dylib 0x1b15717c objc_exception_throw + 33 2 CoreFoundation 0x1bdf752c +[NSException raise:format:] + 103 3 HealthKit 0x273dbdde -[HKObject _validateForCreation] + 111 4 HealthKit 0x273dbc48 +[HKObject _newDataObjectWithMetadata:device:config:] + 219 5 HealthKit 0x273dbb30 +[HKSample _newSampleWithType:startDate:endDate:device:metadata:config:] + 159 6 HealthKit 0x273e9ba8 +[HKWorkout _workoutWithActivityType:startDate:endDate:workoutEvents:duration:totalActiveEnergyBurned:totalBasalEnergyBurned:totalDistance:totalSwimmingStrokeCount:totalFlightsClimbed:goalType:goal:device:metadata:config:] + 431 7 HealthKit 0x274a9342 +[HKWorkout workoutWithActivityType:startDate:endDate:workoutEvents:totalEnergyBurned:totalDistance:device:metadata:] + 109 8 HealthKit 0x274a9160 +[HKWorkout workoutWithActivityType:startDate:endDate:workoutEvents:totalEnergyBurned:totalDistance:metadata:] + 87Thread 0 name: Dispatch queue: com.apple.main-threadThread 0 Crashed:0 libsystem_kernel.dylib 0x1b9e443c __pthread_kill + 81 libsystem_pthread.dylib 0x1baec270 pthread_kill$VARIANT$mp + 3342 libsystem_c.dylib 0x1b96d28e abort + 1063 libc++abi.dylib 0x1b136cfe __cxa_bad_cast + 04 libc++abi.dylib 0x1b136e8a default_unexpected_handler+ 16010 () + 05 libobjc.A.dylib 0x1b1573e0 _objc_terminate+ 29664 () + 1026 libc++abi.dylib 0x1b1493fc std::__terminate(void (*)+ 91132 ()) + 67 libc++abi.dylib 0x1b148ed6 __cxxabiv1::exception_cleanup_func+ 89814 (_Unwind_Reason_Code, _Unwind_Exception*) + 08 libobjc.A.dylib 0x1b157274 _objc_exception_destructor+ 29300 (void*) + 09 CoreFoundation 0x1bdf7530 -[NSException initWithCoder:] + 010 HealthKit 0x273dbde2 -[HKObject _validateForCreation] + 11611 HealthKit 0x273dbc4c +[HKObject _newDataObjectWithMetadata:device:config:] + 22412 HealthKit 0x273dbb34 +[HKSample _newSampleWithType:startDate:endDate:device:metadata:config:] + 16413 HealthKit 0x273e9bac +[HKWorkout _workoutWithActivityType:startDate:endDate:workoutEvents:duration:totalActiveEnergyBurned:totalBasalEnergyBurned:totalDistance:totalSwimmingStrokeCount:totalFlightsClimbed:goalType:goal:device:metadata:config:] + 43614 HealthKit 0x274a9346 +[HKWorkout workoutWithActivityType:startDate:endDate:workoutEvents:totalEnergyBurned:totalDistance:device:metadata:] + 11415 HealthKit 0x274a9164 +[HKWorkout workoutWithActivityType:startDate:endDate:workoutEvents:totalEnergyBurned:totalDistance:metadata:] + 92