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iOS - Null Reference Exception

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Hello, I keep getting a NullReferenceException within Xcode for a few about 20 frames. The null exception is referring to a method called 'ARManager.GetTrackingQuality'. This is the method this; public int GetTrackingQuality(){ return 100; } The error; >NullReferenceException: A null value was found where an object instance was required.> at ARManager.GetTrackingQuality () [0x00000] in :0 I don't quite understand why this is causing an error, all it's doing is returning a predefined int of 100. No errors or warnings show in the Editor at all. Running on Xcode 9 (beta) - so it might be an internal issue with Xcode? Either way, would like to get the bottom of this, incase it cases me issues further down the line. (Post; my formatting bar isn't loading in the web browser for some reason)

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