The UIPDFPageRenderOperation 0x12de5fcf0 object is overridden upon release; break on objc_overrelease_during_dealloc_error for debugging

Question

I add some PDF links to my UIWebView, and every time I load, and I make a scroll gesture, I get this error: "The UIPDFPageRenderOperation 0x14acaca10 object is overridden, but already freed, break on objc_overrelease_during_dealloc_error for debugging." So, is UIPDF freed while scrolling?

Does anyone have a clue?

If I scroll very fast, I’ll even crash. Still happening on iOS 9.3.3.

WKWebView *webView = [[WKWebView alloc] initWithFrame:CGRectMake(0, 20, self.view.frame.size.width, self.view.frame.size.height - 20)];

NSURL *url = [NSURL fileURLWithPath:@"/Users/userName/Desktop/bigIcd.pdf"];

[webView loadFileURL:url allowingReadAccessToURL:url];

[self.view addSubview:webView];