kc3-lang/kc3

diff --git a/libc3/struct.c b/libc3/struct.c
index bdce226..920dc23 100644
--- a/libc3/struct.c
+++ b/libc3/struct.c
@@ -28,7 +28,6 @@ void struct_clean (s_struct *s)
   uw i = 0;
   const s_sym *sym;
   assert(s);
-  assert(s->type);
   data = s->data;
   while (i < s->type.map.count) {
     if (tag_type(s->type.map.value + i, &sym)) {
diff --git a/libc3/window/sdl2/gl_camera.c b/libc3/window/sdl2/gl_camera.c
index 02dd038..fd57698 100644
--- a/libc3/window/sdl2/gl_camera.c
+++ b/libc3/window/sdl2/gl_camera.c
@@ -18,9 +18,6 @@
 s_gl_camera * gl_camera_init (s_gl_camera *camera, uw w, uw h)
 {
   assert(camera);
-  assert(window);
-  assert(window->w);
-  assert(window->h);
   gl_camera_set_aspect_ratio(camera, w, h);
   camera->clip_z_far = 1000;
   camera->clip_z_near = 0.1;
diff --git a/libc3/window/sdl2/gl_sphere.c b/libc3/window/sdl2/gl_sphere.c
index b5ad723..770b11c 100644
--- a/libc3/window/sdl2/gl_sphere.c
+++ b/libc3/window/sdl2/gl_sphere.c
@@ -39,10 +39,10 @@ s_gl_sphere * gl_sphere_init (s_gl_sphere *sphere, uw segments_u,
   s_gl_3d *p;
   f64 r;
   f64 z;
-  assert(s);
-  if (! segments_u)
+  assert(sphere);
+  if (segments_u < 3)
     segments_u = 3;
-  if (! segments_v)
+  if (segments_v < 2)
     segments_v = 2;
   sphere->segments_u = segments_u;
   sphere->segments_v = segments_v;