'NSInvalidArgumentException', reason: '-[_UIBackgroundTaskInfo setStoreObserver:]: unrecognized selector sent to instance 0x282b20780'

Question

In the process of updating some older code, and whilst the code launches, it crashes immediately upon launch. I am using XCode 10, previously this would have worked fine in XCode 7/8

This line in AppController.mm

[[MKStoreManager sharedManager] requestProductData];

That line brings you to

MKStoreManager.m

- (void) requestProductData
{
    SKProductsRequest *request= [[SKProductsRequest alloc] initWithProductIdentifiers: 
                                 [NSSet setWithObjects: /*featureAllLevels, */ foodIAP, vanityIAP, dressIAP, iceIAP, allIAP, nil]]; // add any other product here
    request.delegate = self;
    [request start];
}

The error itself is

objc[680]: MKStoreManager object 0x281ecd020 overreleased while already deallocating; break on objc_overrelease_during_dealloc_error to debug 2019-09-19 12:15:18.342037+0100 PoolParty[680:66967] -[_UIBackgroundTaskInfo setStoreObserver:]: unrecognized selector sent to instance 0x281ecd020 2019-09-19 12:15:18.342502+0100 PoolParty[680:66967] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[_UIBackgroundTaskInfo setStoreObserver:]: unrecognized selector sent to instance 0x281ecd020'

Struggling to figure out this, if anyone could assist I would appreciate!