Thread 1: Fatal error: Unexpectedly found nil while implicitly unwrapping an Optional value

📚 Official Books iOS Apprentice
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Hi, I have problem in Checklists near the end of chapter 16. When I want add new Checklist to Checklists Xcode shows that error and I don’t know how to solve it. Thanks in advance.

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Solve it :slight_smile: I didn’t connect doneBarButton with outlet in storyboard

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Awesome! Thanks for the update. @rupek1997.

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