Cannot set the window icon, illegal instruction

[ghost]

Cannot set the window icon.
(see: code)

(this is not the exact code, but it produces the bug)

pub fn main() !void {
    var gpa = std.heap.GeneralPurposeAllocator(.{}){};

    const callbacks = alka.Callbacks{};

    try alka.init(&gpa.allocator, callbacks, 1024, 768, "main", 0, false);

    var w = alka.getWindow();
    try w.setIcon(alka.getAllocator(), "assets/test.png");

    try alka.open();
    try alka.update();
    try alka.close();

    try alka.deinit();

    const leaked = gpa.deinit();
    if (leaked) return error.Leak;
}

Illegal instruction at address 0x26d18b
include/glfw-3.3.2/src/x11_window.c:0:0: 0x26d18b in _glfwPlatformSetWindowIcon (/path/Alka/include/glfw-3.3.2/src/x11_window.c)
/path/Alka/src/core/glfw.zig:637:22: 0x289a86 in core.glfw.setWindowIcon (main)
    glfwSetWindowIcon(window, count, images);
                     ^
/path/Alka/src/core/window.zig:191:31: 0x284ad8 in core.window.Info.setIcon (main)
        try glfw.setWindowIcon(win.handle, images.len, &images);
                              ^
/path/Alka/src/main.zig:33:18: 0x2827e3 in main (main)
    try w.setIcon(alka.getAllocator(), "assets/test.png")
  
...