I'm not sure if this will help iOS users, but I can tell you how I fixed it for my Android application if someone else encounters this error (and maybe someone can transfer this fix to iOS) .
In FaceBookSDK, I changed com / facebook / widget / WebDialog.java so that as soon as the web dialog has been loaded, it will look for the "Current Goals" block and hide it (if it exists).
In com / facebook / widget / WebDialog.java:
private class DialogWebViewClient extends WebViewClient {
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