Swift - Error: unexpectedly found nil while unwrapping an optional value

Question

I have been making an app in Swift but I keep getting an error in my TableViewController class. I could not find any way to fix this and kept getting this error :

Answer 1

To avoid this Error, must have to make sure one importing thing while declaration of Object :

var isActive: Bool?

? is the important to add, so now you can check nil values whenever you are, accessing this variable named isActive like below:

1. if isActive == nil
2. if let _isActive = isActive as Bool?

So Optional values must be declared with the ?.