Why does `glewInit()` give me a segfault

Im working on a project with opengl using glew and glfw

The project is larger but only the initialisation code doesnt work correctly. Im using glew 2.2.0_1 and glfw 3.3.8 (btw. I ran this in a debugger so Im 100% sure the glewInit() is causing the segfault. And if I put this in a file without the rest of the code its also causing a segfault)

The code is:

#include <GL/glew.h>
#include <GLFW/glfw3.h>

const int WIDTH = 640;
const int HEIGHT = 480;
int main(int argc, char **argv) {
    // Set up GLFW and create window
    glfwInit();
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
    glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);

    GLFWwindow* window = glfwCreateWindow(WIDTH, HEIGHT, "Spinning Cube", nullptr, nullptr);
    glfwMakeContextCurrent(window);
    if (window != nullptr) {
        return 1;
    }
    // Set up GLEW
    glewInit();
    // ...
}

Is it a library error or am I doing something wrong? (For anybody asking this code compiles without any warnings or errors)