Could the following code produce a crash on older devices? - iphone

Question

I have this bit of code relating to my in app purchases for an SKProductRequest:
SKProductsRequest *request= [[SKProductsRequest alloc] initWithProductIdentifiers:...
request.delegate = self;
[request start];
[request release];
One of my users is getting a crash on an iPod4 and I think it might be from this, however, all other devices are able to run this code OK. Should request be saved in a property while its loading, could that be the issue? I would think with [request start], that request would be retained somewhere else.
Here is the crash log:
Last Exception Backtrace:
0 CoreFoundation 0x3275229e __exceptionPreprocess + 158
1 libobjc.A.dylib 0x3a3c597a objc_exception_throw + 26
2 CoreFoundation 0x3269ce88 -[__NSArrayI objectAtIndex:] + 160
3 AppsHappens Lite 0x000e43ac 0xd8000 + 50092
4 StoreKit 0x3450c22e __34-[SKProductsRequest _handleReply:]_block_invoke_0 + 378
5 libdispatch.dylib 0x3a7dd11a _dispatch_call_block_and_release + 6
6 libdispatch.dylib 0x3a7dc4b2 _dispatch_client_callout + 18
7 libdispatch.dylib 0x3a7dddc6 _dispatch_main_queue_callback_4CF$VARIANT$up + 222
8 CoreFoundation 0x32725f36 __CFRunLoopRun + 1286
9 CoreFoundation 0x32698eb8 CFRunLoopRunSpecific + 352
10 CoreFoundation 0x32698d44 CFRunLoopRunInMode + 100
11 GraphicsServices 0x362492e6 GSEventRunModal + 70
12 UIKit 0x345ae2fc UIApplicationMain + 1116
13 AppsHappens Lite 0x000e3a8e 0xd8000 + 47758
14 AppsHappens Lite 0x000dadb4 0xd8000 + 11700
Updated: A lot of folks below are saying that it's an array out of bounds error and I think they're right. Strange thing is though, it appears the product request is coming back successfully, and it's called ing [self loadFullVersionPrice] which simply extracts the price for one of my products. When it tries to retrieve the Full Version product from the products array, I think that's when it crashes. Is it possible the app store would only return some of my products and not all of them? Or some issue with an iPod4?
- (void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response
{
self.products = response.products;
if (self.products)
{
[self loadFullVersionPrice];
}
}
- (void) loadFullVersionPrice
{
SKProduct *product = [[self.products objectAtIndex:[self.products count]-1] retain];
NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
[numberFormatter setFormatterBehavior:NSNumberFormatterBehavior10_4];
[numberFormatter setNumberStyle:NSNumberFormatterCurrencyStyle];
[numberFormatter setLocale:product.priceLocale];
self.fullVersionPrice = [numberFormatter stringFromNumber:product.price];
[numberFormatter release];
[product release];
}
Also, the iPod Touch 4 in question is jail broken.

Answer 1

Three reasons why this was occurring:
1) The user was on a jail broken phone
2) The version of my app he was installing was an ad hoc release
3) He was trying to access in app purchase
Apparently, jail broken phones are unable to access the sandbox (which is accessed when you try to do an app purchase on an ad hoc distribution).