Crash iOS app when create new controller

[definev]

It throwing

* thread #1, queue = 'com.apple.main-thread', stop reason = Swift runtime failure: Unexpectedly found nil while implicitly unwrapping an Optional value
    frame #1: 0x0000000102bb7b04 WinMONEY_DEV`closure #1 in closure #1 in MobileScanner.start(completion=0x0000000102bc4ddc WinMONEY_DEV`partial apply forwarder for closure #2 (mobile_scanner.MobileScanner.MobileScannerStartParameters) -> () in mobile_scanner.SwiftMobileScannerPlugin.start(__C.FlutterMethodCall, (Swift.Optional<Any>) -> ()) -> () at <compiler-generated>, dimensions=CoreMedia.CMVideoDimensions @ 0x000000030665e670, self=0x0000000281a5c820) at MobileScanner.swift:224:40 [opt]
   221 	                    MobileScannerStartParameters(
   222 	                        width: Double(dimensions.height),
   223 	                        height: Double(dimensions.width),
-> 224 	                        hasTorch: self.device.hasTorch,
    	                                       ^
   225 	                        textureId: self.textureId
   226 	                    )
   227 	                )

[llfoo119]

It's my same case.

[navaronbracke]

Ths is a duplicate of #720

[definev]

In my case, because of layout phase is so long so it affect the UI thread and the texture id not ready yet. Solved the layout problem and it run ok

[llfoo119]

I've create the solution that it works fine.