Observing the same issue, while I click I am adding the new player once after removing all the observers, but still able to reproduce the same issue. This issue occurs only after 3-4 correct functioning. Thanks for the help. 0   CoreFoundation                      0x00000001803f41fc __exceptionPreprocess + 236 1   libobjc.A.dylib                     0x000000018016a438 objc_exception_throw + 56 2   AVFCore                             0x00000001b58e98bc __32-[AVPlayerItem _attachToPlayer:]_block_invoke + 0 3   AVFCore                             0x00000001b58cf274 -[AVPlayer _insertItem:afterItem:] + 56 4   SelfLearn                           0x0000000100dead44 $s9SelfLearn0aB11VideoPlayerC18playerEndedPlaying33_783A90EB63367B572AA588642046C941LLyy10Foundation12NotificationVFyycfU_ + 988 5   SelfLearn                           0x0000000100c06bd8 $sIeg_IeyB_TR + 52 6   libdispatch.dylib                   0x000000010276f764 _dispatch_call_block_and_release + 24 7   libdispatch.dylib                   0x0000000102770f34 _dispatch_client_callout + 16 8   libdispatch.dylib                   0x000000010277f674 _dispatch_main_queue_callback_4CF + 1048 9   CoreFoundation                      0x0000000180362ef4 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 12 10  CoreFoundation                      0x000000018035d428 __CFRunLoopRun + 2444 11  CoreFoundation                      0x000000018035c58c CFRunLoopRunSpecific + 572 12  GraphicsServices                    0x000000018b634740 GSEventRunModal + 160 13  UIKitCore                           0x00000001843c5cbc -[UIApplication _run] + 964 14  UIKitCore                           0x00000001843caa9c UIApplicationMain + 112 15  libswiftUIKit.dylib                 0x00000001b1d9a328 $s5UIKit17UIApplicationMainys5Int32VAD_SpySpys4Int8VGGSgSSSgAJtF + 100 16  SelfLearn                           0x0000000100e1c9e0 $sSo21UIApplicationDelegateP5UIKitE4mainyyFZ + 120 17  SelfLearn                           0x0000000100e1c958 $s9SelfLearn11AppDelegateC5$mainyyFZ + 48 18  SelfLearn                           0x0000000100e1ca24 main + 32 19  libdyld.dylib                       0x0000000180221cbc start + 4 ) libc++abi.dylib: terminating with uncaught exception of type NSException *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'An AVPlayerItem cannot be associated with more than one instance of AVPlayer'