Crash: Fatal Exception: NSGenericException

[ravindrashetty]

Seeing this crash on recent releases. Details Below.

Crash Description:

Unable to activate constraint with anchors <NSLayoutYAxisAnchor:0x1049d7540 "SwiftMessages.MaskingView:0x10cd1ffe0.bottom"> and <NSLayoutYAxisAnchor:0x1049d2bf0 "UITabBar:0x10a4e3a00.top"> because they have no common ancestor. Does the constraint or its anchors reference items in different view hierarchies? That's illegal.

Stack trace:

Fatal Exception: NSGenericException
0 CoreFoundation 0x18283ad8c __exceptionPreprocess
1 libobjc.A.dylib 0x1819f45ec objc_exception_throw
2 CoreFoundation 0x18283ac6c -[NSException initWithCoder:]
3 Foundation 0x183186c5c -[NSLayoutConstraint _setActive:mutuallyExclusiveConstraints:]
4 SwiftMessages 0x103963b04 installMaskingView #1 (containerView:) in Presenter.install() (Presenter.swift:351)
5 SwiftMessages 0x1039632ac Presenter.install() (Presenter.swift:417)
6 SwiftMessages 0x103960dd4 Presenter.show(completion:) (Presenter.swift:116)
7 SwiftMessages 0x10396a720 closure #1 in SwiftMessages.dequeueNext() (SwiftMessages.swift:560)
8 SwiftMessages 0x10395c38c thunk for @escaping @callee_guaranteed () -> () ()

[wtmoose]

This is a duplicate of #348.

So far nobody has provided reproduction steps, so I there's not much I can do. If you can help me reproduce, I'll take a look.