Nil
- Go: panic: runtime error: invalid memory address or nil pointer dereference
- NoMethodError: undefined method for nil:NilClass
- panic: runtime error: index out of range / nil pointer dereference
- Swift: Unexpectedly found nil while unwrapping an Optional value
- Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value
- Unexpectedly found nil while unwrapping an Optional value