How is possible that accessing nullptr works? [duplicate]

This question already has an answer here:

• Why am I able to make a function call using an invalid class pointer 6 answers
• Calling class method through NULL class pointer 10 answers

I have a simple class:

class B
{
public:
    int getData() { return 3; }
};

then, I initialize a pointer to it with nullptr:

B *foo{ nullptr };

And then, trying to use it comes the surprise:

int t = foo->getData();

and t is now 3. How is that possible without constructing the class? Is it because getData() does not use "this"? That broke all my knowledge about pointers.

Is that expected behavior? I am working in Visual Studio 2013.