Detour crowd crashes game after klling an bot

Here are more infos:

I use ue4 v 4.2.1.2.

This is what i’am getting from the visual studio debugger:

In CrowdAgentInterface.h he throws an exception at Line 19: GENERATED_IINTERFACE_BODY()

Class CrowdAgentInterface.h:
class ICrowdAgentInterface
{
GENERATED_IINTERFACE_BODY() <-Line 19 Exception!

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}

Class Casts.h:
template <typename From, typename To>
struct TCastImpl<From, To, ECastType::InterfaceToUObject>
{
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UObject* Obj = Src->_getUObject(); <-Line 146
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};

// Dynamically cast an object type-safely.
template <typename To, typename From>
FORCEINLINE To* Cast(From* Src)
{
return TCastImpl<From, To>::DoCast(Src); <-Line 193
}

Class CrowdManager.cpp
void UCrowdManager::PostMovePointUpdate()
{
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UCrowdFollowingComponent* PathComp = Cast<UCrowdFollowingComponent>(It.Key); <-Line 1327
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}

CrowdManager.cpp
void UCrowdManager::Tick(float DeltaTime)
{
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PostMovePointUpdate(); <-Line 267
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}