Unreal Engine crashes declaring pointer in .h file

[strjak]

Hello everyone!

Why unreal engine crashes when i initialize a pointer in the .h class file (img1), but it doesn’t crash when i initialize it into .cpp file, inside the BeginPlay function (img2). Have you any idea about it?. it’s happened with too many others pointers…

[DanM]

It’s not exactly clear what your code is when you are doing it in the header. Do you mean you have this in the header

UPhysicsHandleComponent PhysicsHandle = nullptr;

and then this in the CPP?

GetOwner()->FindComponentByClass<UPhysicsHandleComponent>();

Because that would mean PhysicsHandle will always be nullptr. You never assign it a value afterwards. That line in the cpp should be

PhysicsHandle = GetOwner()->FindComponentByClass<UPhysicsHandleComponent>();

[strjak]

From the UE Course ( Unreal Engine C++ Developer: Learn C++ and Make Video Games) (video 122 - FindComponentByClass), i’m simply trying to create the pointer, just like the video shows, using FindComponentByClass function.
If i create the pointer to Nullptr into .h file (like img1 shows), unreal Crashes, but if i just create the pointer into .cpp file (like img2 shows), the editor doesn’t crash.

[Shaak]

Can you paste Screenshot of the Crash Error report and Unreal Editor compiling log like in second attached screenshot

[Shaak]

Also check did you save yourself everywhere with such checks
if (PhysicsHandle) {
where you using it

[strjak]

Thanks, here more images (new1, new2):

[Shaak]

I can’t reproduce your problem
Looks like something wrong with your class build files, but cant say more, I am new too…

[strjak]

Yes, i hope somebody can help me :C

[DanM]

That doesn’t appear to be crashing from BeginPlay looking at that crash report. Could you try a full rebuild?

Close Unreal and delete your Binaries and Intermediate folders then reopen your project rebuilding when prompted.

[strjak]

Effectively it was a bug, i tried to delete both Binaries and Intermediate folders and it worked! (before i only deleted the Binaries folder). Thanks a lot, have a great week!