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i recieved many crash after i received pasteboard content changed notification. i just monitor the change of pasteboard, and try to recognize the text content.here is my code: class PasteboardMonitor { init() { addPasteboardMonitor() } func addPasteboardMonitor() { handleContentFromPasteBoard(conent: UIPasteboard.general.string, identifier: "\(UIPasteboard.general.changeCount)") NotificationCenter.default.addObserver(self, selector: #selector(didReceivedPasteboardNotification(noti:)), name: UIPasteboard.changedNotification, object: nil) NotificationCenter.default.addObserver(self, selector: #selector(didReceivedPasteboardNotification(noti:)), name: UIApplication.willEnterForegroundNotification, object: nil) NotificationCenter.default.addObserver(self, selector: #selector(didReceivedApplicationNotification), name: UIApplication.willResignActiveNotification, object: nil) } func handleContentFromPasteBoard(conent: String?, identifier: String? = nil) { //handle content ... } @objc func didReceivedPasteboardNotification(noti: Notification) { handleContentFromPasteBoard(conent: UIPasteboard.general.string, identifier: "\(UIPasteboard.general.changeCount)") }the crash log is: Crashed: com.apple.UIKit.pasteboard.cache-queue 0 libsystem_pthread.dylib 0x1963b5a38 ___chkstk_darwin + 64 1 libdispatch.dylib 0x19635f49c _dispatch_mach_send_and_wait_for_reply + 440 2 libdispatch.dylib 0x19635f904 dispatch_mach_send_with_result_and_wait_for_reply + 56 3 libxpc.dylib 0x19629f594 xpc_connection_send_message_with_reply_sync + 240 4 Foundation 0x196ba51fc __NSXPCCONNECTION_IS_WAITING_FOR_A_SYNCHRONOUS_REPLY__ + 16 5 Foundation 0x19696b090 -[NSXPCConnection _sendInvocation:orArguments:count:methodSignature:selector:withProxy:] + 2704 6 Foundation 0x19696a40c -[NSXPCConnection _sendSelector:withProxy:arg1:] + 128 7 Foundation 0x196bac2ac _NSXPCDistantObjectSimpleMessageSend1 + 40 8 Pasteboard 0x1ac476aac -[PBServerConnection localGeneralPasteboard:] 9 UIKitCore 0x19a6c3428 _getTemporaryLocalGeneralPasteboard + 64 10 UIKitCore 0x19a6c2444 _pasteboardCacheQueue_existingItemCollectionWithName + 152 11 UIKitCore 0x19a6c2160 __59+[_UIConcretePasteboard _pasteboardNamed:createIfNotFound:]_block_invoke + 236 12 libdispatch.dylib 0x196349fd8 _dispatch_client_callout + 20 13 libdispatch.dylib 0x1963567f4 _dispatch_lane_barrier_sync_invoke_and_complete + 60 ... 218 UIKitCore 0x19a6c1fcc +[_UIConcretePasteboard _pasteboardNamed:createIfNotFound:] + 396 219 TovApp 0x1014e4a54 PasteboardMonitor.didReceivedPasteboardNotification(noti:) + 123 (PasteboardMonitor.swift:123) 220 TovApp 0x1014e4c4c @objc PasteboardMonitor.didReceivedPasteboardNotification(noti:) + 4351249484 (<compiler-generated>:4351249484) 221 Foundation 0x196a6effc __57-[NSNotificationCenter addObserver:selector:name:object:]_block_invoke_2 + 28 222 CoreFoundation 0x1965fc99c __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 28 223 CoreFoundation 0x1965fc9ec ___CFXRegistrationPost1_block_invoke + 68 224 CoreFoundation 0x1965fbce4 _CFXRegistrationPost1 + 396 225 CoreFoundation 0x1965fb97c ___CFXNotificationPost_block_invoke + 108 226 CoreFoundation 0x196574910 -[_CFXNotificationRegistrar find:object:observer:enumerator:] + 1424 227 CoreFoundation 0x1965fb2ac _CFXNotificationPost + 1268 228 Foundation 0x19695db8c -[NSNotificationCenter postNotificationName:object:userInfo:] + 64 229 UIKitCore 0x19a6c1cd4 _sendPasteboardChangedNotification + 96 230 UIKitCore 0x19a6c1fcc +[_UIConcretePasteboard _pasteboardNamed:createIfNotFound:] + 396 231 TovApp 0x1014e4a54 PasteboardMonitor.didReceivedPasteboardNotification(noti:) + 123 (PasteboardMonitor.swift:123) 232 TovApp 0x1014e4c4c @objc PasteboardMonitor.didReceivedPasteboardNotification(noti:) + 4351249484 (<compiler-generated>:4351249484) 233 Foundation 0x196a6effc __57-[NSNotificationCenter addObserver:selector:name:object:]_block_invoke_2 + 28 234 CoreFoundation 0x1965fc99c __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 28 235 CoreFoundation 0x1965fc9ec ___CFXRegistrationPost1_block_invoke + 68 236 CoreFoundation 0x1965fbce4 _CFXRegistrationPost1 + 396 237 CoreFoundation 0x1965fb97c ___CFXNotificationPost_block_invoke + 108 238 CoreFoundation 0x196574910 -[_CFXNotificationRegistrar find:object:observer:enumerator:] + 1424 239 CoreFoundation 0x1965fb2ac _CFXNotificationPost + 1268 240 Foundation 0x19695db8c -[NSNotificationCenter postNotificationName:object:userInfo:] + 64 241 UIKitCore 0x19a6c1cd4 _sendPasteboardChangedNotification + 96 242 UIKitCore 0x19a6c1fcc +[_UIConcretePasteboard _pasteboardNamed:createIfNotFound:] + 396 243 TovApp 0x1014e4a54 PasteboardMonitor.didReceivedPasteboardNotification(noti:) + 123 (PasteboardMonitor.swift:123) 244 TovApp 0x1014e4c4c @objc PasteboardMonitor.didReceivedPasteboardNotification(noti:) + 4351249484 (<compiler-generated>:4351249484) 245 Foundation 0x196a6effc __57-[NSNotificationCenter addObserver:selector:name:object:]_block_invoke_2 + 28 246 CoreFoundation 0x1965fc99c __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 28 247 CoreFoundation 0x1965fc9ec ___CFXRegistrationPost1_block_invoke + 68 248 CoreFoundation 0x1965fbce4 _CFXRegistrationPost1 + 396 249 CoreFoundation 0x1965fb97c ___CFXNotificationPost_block_invoke + 108 250 CoreFoundation 0x196574910 -[_CFXNotificationRegistrar find:object:observer:enumerator:] + 1424 251 CoreFoundation 0x1965fb2ac _CFXNotificationPost + 1268 252 Foundation 0x19695db8c -[NSNotificationCenter postNotificationName:object:userInfo:] + 64 253 UIKitCore 0x19a6c1cd4 _sendPasteboardChangedNotification + 96 254 UIKitCore 0x19a6c1fcc +[_UIConcretePasteboard _pasteboardNamed:createIfNotFound:] + 396 255 TovApp 0x1014e4a54 PasteboardMonitor.didReceivedPasteboardNotification(noti:) + 123 (PasteboardMonitor.swift:123)do anybody know why this occurs? and how to fix it? thanks.