How do i correct the error message application of instance (#!null)

how do I correct the error message application instance. irritants (#!null)

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The two usual scenarios I have seen for this error are 1) you are using a component in your project, such as an extension, that isn't supported on iOS, or 2) you are using a clock and switching screens, which sometimes can result in the timer event firing during the transition so no screen is technically active. If neither of those is the case, it would be useful for us to see the project so we can run it in a debug version at MIT to root cause the issue.