NSOperationQueue setSuspended Crash iOS

I am having problems debugging a recent crash. I manage to get some feedback from Firebase but I am not able to replicate the conditions. The crash happens when I press the home button and come back into the app some times.

Here is the stack trace and the code I have related to Operations.

EXC_BAD_ACCESS KERN_INVALID_ADDRESS

    Crashed: com.apple.main-thread
0  Foundation                     0x184732c94 __NSOQSchedule + 248
1  Foundation                     0x18465ab50 -[NSOperationQueue setSuspended:] + 164
2  UIKitCore                      0x18849e420 -[UIApplication _stopDeactivatingForReason:] + 1172
3  UIKitCore                      0x187c17628 -[_UISceneLifecycleMultiplexer _performBlock:withApplicationOfDeactivationReasons:fromReasons:] + 436
4  UIKitCore                      0x187c1798c -[_UISceneLifecycleMultiplexer _evalTransitionToSettings:fromSettings:forceExit:withTransitionStore:] + 756
5  UIKitCore                      0x187c17214 -[_UISceneLifecycleMultiplexer uiScene:transitionedFromState:withTransitionContext:] + 340
6  UIKitCore                      0x187c1b930 __186-[_UIWindowSceneFBSSceneTransitionContextDrivenLifecycleSettingsDiffAction _performActionsForUIScene:withUpdatedFBSScene:settingsDiff:fromSettings:transitionContext:lifecycleActionType:]_block_invoke_2 + 196
7  UIKitCore                      0x188001604 +[BSAnimationSettings(UIKit) tryAnimatingWithSettings:actions:completion:] + 856
8  UIKitCore                      0x1880fca0c _UISceneSettingsDiffActionPerformChangesWithTransitionContext + 260
9  UIKitCore                      0x187c1b66c __186-[_UIWindowSceneFBSSceneTransitionContextDrivenLifecycleSettingsDiffAction _performActionsForUIScene:withUpdatedFBSScene:settingsDiff:fromSettings:transitionContext:lifecycleActionType:]_block_invoke + 156
10 UIKitCore                      0x1880fc8f4 _UISceneSettingsDiffActionPerformActionsWithDelayForTransitionContext + 108

And in the AppDelegate class:

    let alertQueue = Foundation.OperationQueue()
    func applicationDidFinishLaunching(_ application: UIApplication) {
...
         alertQueue.isSuspended = true
         alertQueue.maxConcurrentOperationCount = 1
...
    }
        
    func applicationDidBecomeActive(_ application: UIApplication) {
             
         alertQueue.isSuspended = false
    }
            
    func applicationWillResignActive(_ application: UIApplication) {
                
         alertQueue.isSuspended = true
    }
     

Operation Class

class CustomOperation: Operation {
    
    private var _finished = false
    private var _executing = false
    override var isAsynchronous: Bool {return true}
    override var isExecuting: Bool {return _executing}
    override var isFinished: Bool {return _finished}
    
    override func start() {
        guard !isCancelled else {
            reportFinish()
            return
        }
        reportStart()
    }
    
    override func cancel() {
        self.reportFinish()
        super.cancel()
    }
    
    private func reportStart() {
        if !_executing {
            willChangeValue(for: \.isExecuting)
            _executing = true
            didChangeValue(for: \.isExecuting)
        }
    }
    
    private func reportFinish() {
        
        let willChangeExecuting = _executing
        let willChangeFinised = !_finished
        
        if willChangeExecuting {
            willChangeValue(for: \.isExecuting)
        }
        if willChangeFinised {
            willChangeValue(for: \.isFinished)
        }
        
        if willChangeExecuting {
            _executing = false
        }
        if willChangeFinised {
            _finished = true
        }
        
        if willChangeExecuting {
            didChangeValue(for: \.isExecuting)
        }
        if willChangeFinised {
            didChangeValue(for: \.isFinished)
        }
    }
}