Always crash in USkeletalMeshComponent* ACharacter::GetMesh() within 10 minute

My game always crash in USkeletalMeshComponent* ACharacter::GetMesh() within 10 minute, but I cannot debug trace it, I have not any idea how to solve this bug, Who can help me? UE4 version is 4.7.5, My character is create from ACharacter, test platform are PC and Android, Thanks.

crash —>USkeletalMeshComponent* ACharacter::GetMesh() const { return Mesh; }

This is my misstalk, my monster is deleted by me, but I still play its animation, so now it is no problem. thanks.