Address Book propertyID - unknown type?

Working on an app that makes heavy use of the Address Book framework. There are a number of View Controllers that interact with Address Book data, and they all work just fine. Except for one, and it's killing me.

I have a class that wraps address book access, in a method such as:

- (NSDictionary*)labelsToValues:(ABPropertyID)propertyID {
ABAddressBookRef addressBook = ABAddressBookCreate();
ABRecordRef aRecord = ABAddressBookGetPersonWithRecordID(addressBook, [self recordIdFromAddressBookId]);

NSMutableDictionary *entries = [NSMutableDictionary dictionary];    

ABMultiValueRef multiValueProperty = ABRecordCopyValue(aRecord, propertyID);
// do some other stuff

And then I call it in places like开发者_开发技巧 this:

- (NSDictionary*)emailProperties {
return [self labelsToValues:kABPersonEmailProperty];
}

And it works! Of course it does, I'm sending the message with an argument that is a Constant from the Address Book framework. So it should always work!

But that's not the case. This particular emailProperties: message is one that I'm calling in several places... and sometimes it works, but sometimes it doesn't. When things go awry, I put it through the debugger and I get something like this:

How is that possible!? Even odder, if I sort of "prime" the problematic View Controller by viewing other View Controllers where everything behaves as expected, and then I return to the problematic View Controller, everything works fine. So, I'm guessing this is some sort of linking error, but I'm not sure how to even begin with troubleshooting that.

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Turns out my question was a dupe of Address Book constants evaluating as zero, please vote to close.