MKStoreKit突然无法验证商品，无代码变更却出现购买报错求助

报错信息：[MKStoreKit startValidatingAppStoreReceiptWithCompletionHandler:]_block_invoke (MKStoreKit.m:366) NSInvalidArgumentException: *** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[0] __exceptionPreprocess + 1323364 obj...

Hey there, let’s dig into this crash you’re facing—super frustrating when you haven’t touched code but users start hitting errors, right? Based on your context and the crash log, here are the most likely culprits and fixes:

1. App Store Receipt Data Glitches #

MKStoreKit lives and dies on parsing receipt data from Apple’s servers. If those servers had a temporary blip, or users had spotty internet that cut off receipt downloads mid-way, critical fields (like transaction IDs, receipt data blobs, or purchase metadata) might come back as nil. When the code tries to stuff that nil value into a dictionary at line 366, it throws this exact exception. This is the top suspect since you didn’t modify any code.

2. iOS Version Compatibility Edge Cases #

Even if you didn’t update your app, some users might have recently upgraded to a new iOS version (like iOS 17.x). Older MKStoreKit versions often don’t account for subtle shifts in Apple’s receipt format that come with new OS releases. For example, a field that was always present in older iOS receipts might now be optional, leading the library to pull a nil value when assembling that dictionary.

3. Latent Bug in Your MKStoreKit Version #

If you’re using an older, unmaintained build of MKStoreKit, there might be a hidden bug that only triggers under specific receipt conditions. Chances are the code at line 366 skips a nil check for the object it’s inserting into the dictionary—something that never came up until Apple’s receipt responses changed in a tiny, unforeseen way.

Quick Troubleshooting Steps: #

• Inspect Line 366 in MKStoreKit.m: Look at exactly which object is coming up nil. Is it the raw receipt data? A transaction identifier? Knowing this will narrow down whether the issue is with receipt download or parsing.
• Add Defensive Checks: Temporarily add a nil check before that dictionary initialization to prevent crashes. For example:

  // Verify the object isn't nil before creating the dictionary
  id receiptField = [self criticalReceiptField];
  if (receiptField != nil) {
      NSDictionary *receiptDict = [[NSDictionary alloc] initWithObjects:@[receiptField] 
                                                               forKeys:@[kMKStoreKitReceiptKey] 
                                                                 count:1];
  } else {
      // Log the issue and retry validation gracefully
      NSLog(@"Warning: Missing required receipt field, skipping dictionary creation");
      [self retryReceiptValidation];
  }
  

• Check Apple’s System Status: Confirm if there were recent outages or issues with the App Store receipt service (you can find this on Apple’s developer system status page).
• Update MKStoreKit: If a newer version exists, upgrade it—maintained builds usually include fixes for receipt parsing changes from Apple.

内容的提问来源于stack exchange，提问作者birdcage