“Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value” in Swift. (for boolean value)

Question

I looked at other questions but could not solve my problem.

Also, this code line crash in firebase crashlytics.

How can I fix? Thanks.

if AUserDefaults.read(key: UDKeys.local_token.rawValue) != nil {
    if !BTSingleton.sharedInstance.isContractVersionCheckRequired {
        getMyShipments()
    }
}

Error screenshot

What is `isContractVersionCheckRequired` in `BTSingleton`? Is it an implicitly unwrapped optional? You need to at least show the code for that object. — Paulw11, Mar 26 '21 at 19:44
@Paulw11 You are right, sorry. It is not optional. In BTSingleton: `var isContractVersionCheckRequired : Bool!` — bozkurt, Mar 26 '21 at 19:57
It is an implicitly unwrapped optional (that is what the ! means). You need to check what is supposed to have assigned a value to that, or make it a true optional or at least conditionally unwrap it to see if it has a value. — Paulw11, Mar 26 '21 at 20:29

score 0 · Accepted Answer · answered Mar 26 '21 at 22:37

Just need to make sure you have a bool before you read it. I would write it like this because I feel its cleaner:

// this approach compares the optional to false so if it is tru or nil it doesn't get executed
    if BTSingleton.sharedInstance.isContractVersionCheckRequired == false {
                getMyShipments()
            }

But you could write it like this it may be easier to understand:

// this approach safely unwraps the optional and then checks the value
    if let versionCheckRequired = BTSingleton.sharedInstance.isContractVersionCheckRequired, versionCheckRequired == false {
        getMyShipments()
    }

Thank you! I tried your code and the error was cleared. – bozkurt Mar 27 '21 at 08:00 — bozkurt, Mar 27 '21 at 08:00

“Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value” in Swift. (for boolean value)

1 Answers1