Is accessing static class member via unitilialized pointer UB?

A follow-up question to this one

We have the following code:

#include <iostream>struct A {    static int n;};int A::n = 5;int main() {    A* a; //uninitialized on purpose    std::cout << a->n; //UB?}

Is such access an Undefined Behaviour? On one side, no object is needed to access static class members, on the other, operator-> on uninitialized pointer is asking for trouble.

Note: GCC and MSVC compiles this code without any warnings, Clang complains about uninitialized usage. https://godbolt.org/z/Gy5fR2