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With is a minimal macOS SwiftUI app and ContentView.swift with the following code, I can reproduce the crash with specific string. // // ContentView.swift // NLTokenizerTest // // Created by repoleved on 24/03/2022. // import SwiftUI import NaturalLanguage struct ContentView: View { @FocusState private var textIsFocused @State private var text = "" @State private var transformed = "" var body: some View { Form { Section(header: Text("Input")) { TextEditor(text: $text) .font(.body) .multilineTextAlignment(.leading) .disableAutocorrection(true) .frame(minHeight: 100) .onChange(of: text, perform: { _ in transformed = scramble(text) }) .focused($textIsFocused) } Section(header: Text("Scrambled")) { TextEditor(text: $transformed) .disabled(true) .font(.body) .multilineTextAlignment(.leading) .frame(maxWidth: .infinity, minHeight: 100) .allowsHitTesting(false) } } .frame(minWidth: 400) .padding() .onAppear(perform: { textIsFocused = true }) } func scramble(_ text: String) -> String { var transformed = text print("text: \"\(text)\"") var wordRanges: [Range<String.Index>] = [] let tokenizer = NLTokenizer(unit: .word) tokenizer.string = transformed tokenizer.enumerateTokens(in: transformed.startIndex..<transformed.endIndex) { range, _ in if transformed[range].count > 3 { let subrange = transformed.index(range.lowerBound, offsetBy: 1)..<transformed.index(range.upperBound, offsetBy: -1) wordRanges.append(subrange) } return true } wordRanges.reversed().forEach { range in let substring = String(transformed[range]) print("substring: \"\(substring)\"") transformed.replaceSubrange(range, with: substring.shuffled()) } return transformed } } struct ContentView_Previews: PreviewProvider { static var previews: some View { ContentView() } }