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Home/ Questions/Q 8727663
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Editorial Team
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Editorial Team
Asked: June 13, 20262026-06-13T08:28:39+00:00 2026-06-13T08:28:39+00:00

I have a crash log that I haven’t been able to decipher: If I

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I have a crash log that I haven’t been able to decipher:

enter image description here

If I had to guess this had to do me doing a UI upgrade on the background thread. Can anyone enlighten me or possibly give me more clue on what this crash log means?

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  1. Editorial Team
    Editorial Team
    2026-06-13T08:28:40+00:00Added an answer on June 13, 2026 at 8:28 am

    Yep. It looks like your trying to update a webview on a background thread, To check if this is the case, find wherever you are updating your UIWebView and put this line of code in.

    NSLog(@"[%@ %@] Is Main Thread? %@",NSStringFromClass([self class]), NSStringFromSelector(_cmd),[NSThread isMainThread]?@"YES":@"NO");
    

    It will print the name of the class, function, and if you are on the main thread or not.

    If you are not on the main thread, then you can do a simple if(!mainthread) then performSelectorOnMainThread to execute the relevant code on the main thread.

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