Editor crash with C++ AI Controller

Development Programming & Scripting AI
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1

Hi,
I’ve tried to move my AI controller from blueprint to code, and it compiles nicely, but when I try to either play in editor or even navigate to my pawn’s blueprint’s directory to try and change its’ AI controller, editor crashes. I must’ve made some error in AI controller class, but can’t really see it.

TankAICon.h

#pragma once

#include "Runtime/AIModule/Classes/BehaviorTree/BlackboardComponent.h"

#include "AIController.h"
#include "TankAICon.generated.h"

UCLASS()
class TANKTICS_API ATankAICon : public AAIController
{
	GENERATED_BODY()

	virtual void Possess(class APawn* InPawn) override;
	
public:
	UFUNCTION(BlueprintCallable, Category = "Movement")
		void NavigateToPoint(FVector PointLoc);

	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Config")
		UBlackboardComponent* BlackboardComp;
	UPROPERTY(VisibleAnywhere, BlueprintReadOnly, Category = "Config")
		UBehaviorTreeComponent* BehaviorComp;

TankAICon.cpp

#include "Tanktics.h"
#include "TankAICon.h"

#include "Tank.h"


void ATankAICon::Possess(APawn* InPawn)
{
	Super::Possess(InPawn);

	ATank* ControlledTank = Cast<ATank>(InPawn);
	if (ControlledTank)
	{
		if (ControlledTank->BehaviorComp->BlackboardAsset)
			BlackboardComp->InitializeBlackboard(*ControlledTank->BehaviorComp->BlackboardAsset);

		BehaviorComp->StartTree(*ControlledTank->BehaviorComp);
	}

}

void ATankAICon::NavigateToPoint(FVector PointLoc)
{
	float PathLength;
	GetWorld()->GetNavigationSystem()->GetPathLength(GetPawn()->GetActorLocation(), PointLoc, PathLength);
	GEngine->AddOnScreenDebugMessage(-1, 2.f, FColor::Blue, "Path length: " + FString::SanitizeFloat(PathLength));
}

Also, I’ve uploaded log file here, if it happens to be needed.

I hope someone notices my error, thanks in advance :slight_smile:

2

Maybe BehaviorComp wasn’t initialized. Have you tried stepping through it with the debugger?

3

Debugger was indeed crashing in place where I used BehaviorComp. It seems I’ve made some error in my character’s class, but now it works. Thanks! :slight_smile: