How to resolve system class crashes?

You'd better explain the context and show the code where crash occurs.

Load the HTML on the WKWebView Nested video tabs inside and then hit Landscape/Full Screen, and the video crashes when it's full screen

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Load the HTML on the WKWebView Nested video tabs inside and then hit Landscape/Full Screen, and the video crashes when it's full screen

Do you have an Apple crash report for this? If so, please post it here, using the advice from Posting a Crash Report.

You tagged your thread with FairPlay Streaming. Is there some reason you think that’s involved.

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