Spotify SPTAuth canHandleURL is crashing with NSInvalidArgumentException - ios

Question

I have upgraded Spotify from Beta6 to Beta9. One of the necessary changes to support the upgrade is to the canHandleURL method signature. The Beta6 signature was:
canHandleURL: withDeclaredRedirectURL:
The new signature removes withDeclaredRedirectURL. However, when I try to execute the method with the new signature from my appDelegate in the following manner:
-(BOOL)application:(UIApplication *)application
openURL:(NSURL *)url
sourceApplication:(NSString *)sourceApplication
annotation:(id)annotation {
if ([[SPTAuth defaultInstance] canHandleURL:url]) {
[[SPTAuth defaultInstance]
handleAuthCallbackWithTriggeredAuthURL:url callback:^(NSError *error, SPTSession *session) {
if (error != nil) {
...
return;
}
// Save the session info
...
}];
return YES;
}
...
return NO;
}
The error is as follows:
*** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '- [__NSCFString hasPrefix:]: nil argument'
*** First throw call stack:
(
0 CoreFoundation 0x0000000112eeec65 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x0000000112b87bb7 objc_exception_throw + 45
2 CoreFoundation 0x0000000112eeeb9d +[NSException raise:format:] + 205
3 CoreFoundation 0x0000000112e0ee00 -[__NSCFString hasPrefix:] + 96
4 MyAPP 0x000000010fa64c0a -[SPTAuth _canHandleURL:withDeclaredRedirectURL:] + 143
5 MyAPP 0x000000010fa64c7e -[SPTAuth canHandleURL:] + 82
6 MyAPP 0x000000010f9e8c09 -[myAppDelegate application:openURL:sourceApplication:annotation:] + 73
7 UIKit 0x0000000111159cd0 __45-[UIApplication _applicationOpenURL:payload:]_block_invoke + 144
8 UIKit 0x0000000111159c31 -[UIApplication _applicationOpenURL:payload:] + 333
9 UIKit 0x0000000111162328 -[UIApplication _handleNonLaunchSpecificActions:forScene:withTransitionContext:] + 2350
10 UIKit 0x0000000111165e71 __88-[UIApplication _handleApplicationLifecycleEventWithScene:transitionContext:completion:]_block_invoke + 196
11 UIKit 0x0000000111165d9e -[UIApplication _handleApplicationLifecycleEventWithScene:transitionContext:completion:] + 349
12 UIKit 0x00000001111507fa -[UIApplication scene:didUpdateWithDiff:transitionContext:completion:] + 486
13 FrontBoardServices 0x00000001175605e5 __31-[FBSSerialQueue performAsync:]_block_invoke_2 + 21
14 CoreFoundation 0x0000000112e2241c __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 12
15 CoreFoundation 0x0000000112e18165 __CFRunLoopDoBlocks + 341
16 CoreFoundation 0x0000000112e17f25 __CFRunLoopRun + 2389
17 CoreFoundation 0x0000000112e17366 CFRunLoopRunSpecific + 470
18 GraphicsServices 0x00000001138f6a3e GSEventRunModal + 161
19 UIKit 0x0000000111152900 UIApplicationMain + 1282
20 MyAPP 0x000000010f9925b1 main + 97
21 libdyld.dylib 0x0000000113420145 start + 1
22 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
This code appears to follow the iOS SDK tutorial, so I am not sure why this is crashing. When I updated the Spotify.framework, I deleted the old one (moved to trash) and I deleted the Derived Data to clear out the cache in the compiler. Then I dragged the new Spotify.framework into Xcode. Can you see if I have made some mistake? Please help.