UIViewControllerHierarchyInconsistency crash

[Mauro Sasso Coletes]

We are experiencing this crash using IMA SDK iOS 3.26.1:

Fatal Exception: UIViewControllerHierarchyInconsistency

child view controller:<IMAAdViewController: 0x142900f00> should have parent view controller:<APP.DetailViewController: 0x132cc3600> but actual parent is:<SWRevealViewController: 0x1240a0a00>

We are setting the parent view controller correctly to IMA as DetailViewController. Still, for some reason, the SDK searches the view hierarchy and changes the parent view controller to BaseNavigationController. When it crashes, it changes to SWRevealViewController.

The crash is inconsistent; I can't reproduce it when running locally with Xcode, and it does not occur every time. There are spikes from time to time that we see on Crashlytics.

This is our view hierarchy:

SWRevealViewController (root)
└── BaseNavigationController
    └── FeedViewController (root of nav stack)
        └── DetailViewController (pushed)

[IMA SDK]

Hi,

Thank you for contacting the IMA SDK support team.

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• Full stack trace of the crash
   
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[2025-09-04 12:53:02Z GMT] This message is in relation to case "ref:!00D1U01174p.!500Ht01u5ouT:ref" (ADR-00331840)