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copied!<p>Elaborating on Shawn's answer, in <code>- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions</code> you probably have some code like this:</p> <pre><code>- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions { for (SKPaymentTransaction *transaction in transactions) { switch (transaction.transactionState) { case SKPaymentTransactionStatePurchased: [self completeTransaction:transaction]; break; case SKPaymentTransactionStateFailed: [self failedTransaction:transaction]; break; case SKPaymentTransactionStateRestored: [self restoreTransaction:transaction]; default: break; } } } - (void) restoreTransaction: (SKPaymentTransaction *)transaction { /* Handle restore here */ [[SKPaymentQueue defaultQueue] finishTransaction: transaction]; } </code></pre> <p>You can handle nil productIdentifiers in <code>restoreTransaction:</code> by adding a check to see if the productIdentifier is nil, like this:</p> <pre><code>- (void) restoreTransaction: (SKPaymentTransaction *)transaction { if (!transaction.originalTransaction.payment.productIdentifier) { NSLog(@"productIdentifier is nil; Apple bug?"); [[SKPaymentQueue defaultQueue] finishTransaction: transaction]; return; } /* Handle restore here */ [[SKPaymentQueue defaultQueue] finishTransaction: transaction]; } </code></pre> <p>This technique fixed the problem for me in my app. The app started, logged "productIdentifier is nil; Apple bug?" and didn't crash. When I then manually re-restored transactions, Apple sent a valid transaction, and the app worked as designed.</p>

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