ios – iphonexs max crash, and it always happened when the app returns from the background to the foreground

[CAGradientLayer _clearContents]: Unrecognized selector sent to instance 0x2815c31a0

Core Foundation _exceptionPreprocess + 232
1 libobjc.A.dylib objc_exception_throw + 60
2 Core Foundation -[NSOrderedSet initWithSet:copyItems:]
3 CoreFoundation ____weiter_
+ 1412
4 CoreFoundation _CF_forwarding_prep_0 + 96
5 UIKitCore -[UILabel _startMarquee] + 3332
6 libdispatch.dylib dispatch_call_block_and_release + 32
7 libdispatch.dylib __dispatch_client_callout + 20
8 libdispatch.dylib _dispatch_main_queue_callback_4CF + 1012
9 CoreFoundation ___CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE
+ 16
10 CoreFoundation ___CFRunLoopRun + 1888
11 CoreFoundation CFRunLoopRunSpecific + 452
12 Graphics Services GSEventRunModal + 108
13 UIKitCore UIApplicationMain + 216
14 Èáë õø main (main.m: 14)
15 libdyld.dylib _start + 4

and it just happened to iphonexs max, and it always happened, if the app returned from the background in the foreground, could you help me, thank you