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

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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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.
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.