Nil argument to NSCFString

[nikolaigeorgie]

Seeing this issue when attempting to use the Instagram provider:

WebKit discarded an uncaught exception in the webView:decidePolicyForNavigationAction:request:frame:decisionListener: delegate: <NSInvalidArgumentException> -[__NSCFString hasPrefix:]: nil argument

Fairly positive I'm using the library correctly (Obviously using my real consumer key and secret):

        SimpleAuth.configuration()["instagram"] = [
            "consumer_key": "<CONSUMER_KEY>",
            "consumer_secret": "<CONSUMER_SECRET>"
        ]

        SimpleAuth.authorize("instagram") { responseObject, error in
            print( \(responseObject))
        }

The view controller that should show the web view pointed at the Instagram login page is presenting but not loading. The crash seems to happen in the -isTargetRedirectURL: method specifically on the line that calls -hasPrefix:.

Would appreciate any help on this issue.