Step 0: Are you in the right place?

• For issues or feature requests related to the code in this repository
  file a Github issue.
  • If this is a feature request please use the Feature Request template.
• For general technical questions, post a question on StackOverflow
  with the firebase tag.
• For general (non-iOS) Firebase discussion, use the firebase-talk
  google group.
• For backend issues, console issues, and other non-SDK help that does not fall under one
  of the above categories, reach out to
  Firebase Support.
• Once you've read this section and determined that your issue is appropriate for
  this repository, please delete this section.

[REQUIRED] Step 1: Describe your environment

• Xcode version: 12.0
• Firebase SDK version: 6.32.0
• Firebase 6.32.2
• FirebaseABTesting 4.2.0
• FirebaseAnalytics 6.8.2
• FirebaseCore 6.10.2
• FirebaseCoreDiagnostics 1.6.0
• FirebaseDatabase 6.6.0
• FirebaseInstallations 1.7.0
• FirebaseInstanceID 4.6.0
• FirebaseMessaging 4.6.2
• FirebasePerformance 3.3.0
• FirebaseRemoteConfig 4.9.0
• Installation method: CocoaPods

[REQUIRED] Step 2: Describe the problem

Steps to reproduce:

• (void)fetchWithExpirationDuration:(NSTimeInterval)expirationDuration
  completionHandler:(void (^_Nullable)(FIRRemoteConfigFetchStatus status,
  NSError *_Nullable error))completionHandler;
  when this function is called, app is crashing sometimes.Please find crash log below

Relevant Code:

Crash *** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[0]
with following stack trace

Fatal Exception: NSInvalidArgumentException
0 CoreFoundation 0x190f66180 __exceptionPreprocess
1 libobjc.A.dylib 0x19013e9f8 objc_exception_throw
2 CoreFoundation 0x190edfbec _CFArgv
3 CoreFoundation 0x190e67898 -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]
4 CoreFoundation 0x190e58474 +[NSDictionary dictionaryWithObjects:forKeys:count:]
5 Connect 0x10198feb0 __60-[RCNConfigFetch fetchWithUserProperties:completionHandler:]_block_invoke_2 + 413 (RCNConfigFetch.m:413)
6 libdispatch.dylib 0x1909a3a38 _dispatch_call_block_and_release
7 libdispatch.dylib 0x1909a47d4 _dispatch_client_callout
8 libdispatch.dylib 0x19094d324 _dispatch_lane_serial_drain$VARIANT$mp
9 libdispatch.dylib 0x19094de40 _dispatch_lane_invoke$VARIANT$mp
10 libdispatch.dylib 0x1909564ac _dispatch_workloop_worker_thread
11 libsystem_pthread.dylib 0x190b85114 _pthread_wqthread
12 libsystem_pthread.dylib 0x190b87cd4 start_wqthread