Crash in Observation+Combine l.36

[benrudhart]

Hi there,
I'm using a combine publisher like this

    private var myPublisher: NonFailingPublisher<Foo?> {
        Defaults
            .publisher(<FooName>, options: [.initial, .new])
            .compactMap { $0.newValue }
            .eraseToAnyPublisher()
    }

the output is assigned (through some mapping) to a text in a UILabel.

But when executed Defaults crashes in Observation+Combine l.36:

private func observationCallback(_ change: BaseChange) {
	_ = subscriber?.receive(change)
}

reason: Thread 1: Fatal error: Invalid state: Received value before receiving subscription

Maybe this issue is helpful (same error reason): CombineCommunity/RxCombine#6

One (hacky) way to fix this could be to dispatch _ = subscriber?.receive(change) to the next run loop via DispatchQueue.main.async { ... }

[sindresorhus]

// @fredyshox

[fredyshox]

I can look into that.

[benrudhart]

thank you!

[fredyshox]

I fixed this bug in #39, sorry it took so long. It's weird, because I've been personally using this API in various projects, but never with .initial option, which caused issue here.

[benrudhart]

Thank you for fixing this! 👏