Inexplicable random physics crash!!!

crash stack: [TABLE]

#00 pc 02996588 libUE4.so onContact (D:\iGame\UE4181\Engine\Source\ThirdParty\PhysX\PhysX_3.4\Include\common/PxBase.h:111 [Inline: typeMatch<physx::PxRigidBody>]) [armeabi-v7a]

2 #01 pc 02febed0 libUE4.so fireQueuedContactCallbacks (D:\Build++UE4+Release-4.18+PhysX_Compile\Sync\Engine\Source\ThirdParty\PhysX\PhysX_3.4\Source\SimulationController\src/ScScene.cpp:4384) [armeabi-v7a]

3 #02 pc 02f9a108 libUE4.so fetchResults (D:\Build++UE4+Release-4.18+PhysX_Compile\Sync\Engine\Source\ThirdParty\PhysX\PhysX_3.4\Source\PhysX\src/NpScene.cpp:2308 [Inline: fireQueuedContactCallbacks]) [armeabi-v7a]

4 #03 pc 029920a4 libUE4.so SubstepSimulationEnd (D:\iGame\UE4181\Engine\Source\Runtime\Engine\Private\PhysicsEngine/PhysSubstepTasks.cpp:437) [armeabi-v7a]

5 #04 pc 00ce6fb0 libUE4.so TBaseRawMethodDelegateInstance<false, EffectReloadWait, void (int, int)>::ExecuteIfSafe(int, int) const [armeabi-v7a]

6 #05 pc 01aee624 libUE4.so ExecuteTask (D:\iGame\UE4181\Engine\Source\Runtime\Core\Public\Delegates/DelegateSignatureImpl.inl:624) [armeabi-v7a]

7 #06 pc 013b5258 libUE4.so ProcessTasksUntilIdle (Runtime/Core/Public\Async/TaskGraphInterfaces.h:467) [armeabi-v7a]

8 #07 pc 02b544c8 libUE4.so ReleaseTickGroup (D:\iGame\UE4181\Engine\Source\Runtime\Engine\Private/TickTaskManager.cpp:565) [armeabi-v7a]

9 #08 pc 02b52360 libUE4.so RunTickGroup (D:\iGame\UE4181\Engine\Source\Runtime\Engine\Private/TickTaskManager.cpp:1460) [armeabi-v7a]

10 #09 pc 027e4d80 libUE4.so Tick (D:\iGame\UE4181\Engine\Source\Runtime\Engine\Private/LevelTick.cpp:1437 [Inline: RunTickGroup]) [armeabi-v7a]

11 #10 pc 026d9f00 libUE4.so Tick (D:\iGame\UE4181\Engine\Source\Runtime\Engine\Private/GameEngine.cpp:1220) [armeabi-v7a]

12 #11 pc 011234b0 libUE4.so Tick (D:\iGame\Survive\Source\Basic\Private/UAEGameEngine.cpp:82) [armeabi-v7a]

13 #12 pc 00a9b3f4 libUE4.so Tick (D:\iGame\UE4181\Engine\Source\Runtime\Launch\Private/LaunchEngineLoop.cpp:3460) [armeabi-v7a]

14 #13 pc 00a978e0 libUE4.so AndroidMain (D:\iGame\UE4181\Engine\Source\Runtime\Launch\Private\Android/LaunchAndroid.cpp:376) [armeabi-v7a]

15 #14 pc 00a9c8b0 libUE4.so android_main (D:\iGame\UE4181\Engine\Source\Runtime\Launch\Private\Android/LaunchAndroid.cpp:487) [armeabi-v7a]

16 #15 pc 00ab8f90 libUE4.so android_app_entry (C:/NVPACK/android-ndk-r12b/sources/android/native_app_glue/android_native_app_glue.c:233) [armeabi-v7a]

17 #16 pc 000478f7 /system/lib/libc.so (__pthread_start(void*)+22) [armeabi-v8]

18 #17 pc 0001af65 /system/lib/libc.so (__start_thread+32) [armeabi-v8]

19 java:

20 [Failed to get java stack]