I have a Swift project with a Bridging-Header to the following Objective-C method: - (NSData* _Nullable)get_data_pointer_without_error; // header - (NSData*)get_data_pointer_without_error { return NULL; } The Swift signature (as expected) is func get_data_pointer_without_error() -> Data?. When I call this from Swift it successfully returns a nil Data?. But here is the same method which also can throw an error: - (NSData* _Nullable)get_data_pointer_with_error:(NSError* _Nullable* _Nullable)error; // header - (NSData*)get_data_pointer_with_error:(NSError* _Nullable* _Nullable)error { return NULL; } When I call this from Swift it crashes with the error shown below. Xcode shows that the Swift signature is func get_data_pointer_with_error() throws -> Data. It adds throws as expected, but instead of Data? it returns Data. (No surprise that the return of NULL from Objective-C makes it crash.) My question: How to return a nullable NSData* from an Objective-C method which also throws? Sample project: https://github.com/jefft0/swift-objc-data/blob/main/swift-objc-data/main.swift Output: get_data_pointer_without_error returned Fatal error: Error raised at top level: Foundation._GenericObjCError.nilError: file /AppleInternal/BuildRoot/Library/Caches/com.apple.xbs/Sources/swiftlang/swiftlang-1103.8.25.8/swift/stdlib/public/core/ErrorType.swift, line 200