ios – Swift crashing with sign SIGABRT with the core information

In some methods, this code labored completely as a result of it toggled on and off. Typically it really works nice, generally it crashes, and generally it really works completely. May you please inform me what went flawed with this code?

func downloadExchangeRateFromPast(toDate: Date, fromCurrency: String) {
    startupCheck_ExchangeRateFromPast.enter()
    let dateFormatter = DateFormatter()
    dateFormatter.dateFormat = "yyyy-MM-dd"
    let fromDate = dateFormatter.string(from: toDate)
    
    let url = "https://api.exchangerate.host/convert?from=(currentCurrency)&to=(fromCurrency)&date=(fromDate)"
    let session = URLSession(configuration: .default)
    
    session.dataTask(with: URL(string: url)!) { (information, response, _) in
        guard let JSONData = information else {
            startupCheck_ExchangeRateFromPast.go away()
            return
        }
        
        if let response = response as? HTTPURLResponse { print("Change Standing: (response.statusCode)") }
        
        do {
            let finalData = attempt JSONDecoder().decode(ExchangeRatePastJSON.self, from: JSONData)
            
            let newExchangeRate = ExchangeRateConvert(context: contextDataCore)
            newExchangeRate.date = toDate
            newExchangeRate.fromCode = fromCurrency
            newExchangeRate.toCode = currentCurrency
            newExchangeRate.rateConvert = finalData.end result
            
            let newExchangeHistoryRecord = ExchangeHistoryRecord(context: contextDataCore) // Thread 20: sign SIGABRT
            newExchangeHistoryRecord.finalRecord = "(toDate) - (fromCurrency) - (currentCurrency)"
            
            attempt contextDataCore.save()
            startupCheck_ExchangeRateFromPast.go away()
        } catch { startupCheck_ExchangeRateFromPast.go away() }
    }
    .resume()
}