Debug draw crash

[breakingtime]

check options of Debug Draw Surface Collision , and run in PIE, sometimes crash happens：

Assertion failed: (Index >= 0) & (Index < ArrayNum) [File:D:\Program Files\Jenkins\Data\workspace\U1_Engine\Engine\Source\Runtime\Core\Public\Containers/Array.h] [Line: 703] Array index out of bounds: 4 from an array of size 4

UE4Editor_Core
UE4Editor_Core
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_Engine
UE4Editor_SPCRJointDynamics_0001!FAnimNode_SPCRJointDynamics::Debug_DrawSurfaceTriangle() [J:\U1\Client\u1_cn_cn\branches\SPCRJointDynamicsUE4-master\SPCRJointDynamicsUE4-master\MyProject\Plugins\SPCRJointDynamics\Source\SPCRJointDynamics\Private\AnimNode_SPCRJointDynamics.cpp:1601]
UE4Editor_SPCRJointDynamics_0001!FAnimNode_SPCRJointDynamics::DebugDrawSurfaceCollision() [J:\U1\Client\u1_cn_cn\branches\SPCRJointDynamicsUE4-master\SPCRJointDynamicsUE4-master\MyProject\Plugins\SPCRJointDynamics\Source\SPCRJointDynamics\Private\AnimNode_SPCRJointDynamics.cpp:1697]
UE4Editor_SPCRJointDynamics_0001!FAnimNode_SPCRJointDynamics::EvaluateSkeletalControl_AnyThread() [J:\U1\Client\u1_cn_cn\branches\SPCRJointDynamicsUE4-master\SPCRJointDynamicsUE4-master\MyProject\Plugins\SPCRJointDynamics\Source\SPCRJointDynamics\Private\AnimNode_SPCRJointDynamics.cpp:164]