Fatal Exception: NSInvalidArgumentException

*** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[3]

Fatal Exception: NSInvalidArgumentException

0 CoreFoundation 0x990fc __exceptionPreprocess

1 libobjc.A.dylib 0x15d64 objc_exception_throw

2 CoreFoundation 0x1a2564 -[__NSCFString characterAtIndex:].cold.1

3 CoreFoundation 0x1ad6e0 -[__NSPlaceholderDictionary initWithCapacity:].cold.1

4 CoreFoundation 0x56514 -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]

5 CoreFoundation 0x74ebc +[NSDictionary dictionaryWithObjects:forKeys:count:]

6 Shake 0xdf274 -[SHKTicket adaptToDatabaseRecord] + 105 (SHKTicket.m:105)

7 Shake 0x2e284 -[SHKSqliteDatabase insertDatabaseRecord:] + 474 (SHKSqliteDatabase.m:474)

8 Shake 0x2ec84 -[SHKSqliteDatabase bulkInsertDatabaseRecords:] + 561 (SHKSqliteDatabase.m:561)

9 Shake 0x95644 __34-[SHKChatService fetchUserTickets]_block_invoke + 130 (SHKChatService.m:130)

10 libdispatch.dylib 0x2924 _dispatch_call_block_and_release

11 libdispatch.dylib 0x4670 _dispatch_client_callout

12 libdispatch.dylib 0xbdf4 _dispatch_lane_serial_drain

13 libdispatch.dylib 0xc968 _dispatch_lane_invoke

14 libdispatch.dylib 0x171b8 _dispatch_workloop_worker_thread

15 libsystem_pthread.dylib 0x10f4 _pthread_wqthread

16 libsystem_pthread.dylib 0xe94 start_wqthread