diff --git a/WINGs/wclient_wl.c b/WINGs/wclient_wl.c
index 565a63c..59b99f2 100644
--- a/WINGs/wclient_wl.c
+++ b/WINGs/wclient_wl.c
@@ -397,8 +397,16 @@ static const struct xdg_toplevel_listener xdg_toplevel_listener = {
 static void
 wl_client_toplevel_commit_locked(WLClientToplevel *top)
 {
-    if (!top || !top->configured || !top->buf || !top->buf->wl_buf)
+    if (!top || !top->configured || !top->buf || !top->buf->wl_buf) {
+        wwarning("commit_locked: SKIP top=%p configured=%d buf=%p wl_buf=%p",
+                 (void*)top, top ? top->configured : -1,
+                 top ? (void*)top->buf : NULL,
+                 (top && top->buf) ? (void*)top->buf->wl_buf : NULL);
         return;
+    }
+    wwarning("commit_locked: COMMIT top=%p surface=%p buf=%p (%dx%d)",
+             (void*)top, (void*)top->surface, (void*)top->buf,
+             top->buf->width, top->buf->height);
     wl_surface_attach(top->surface, top->buf->wl_buf, 0, 0);
     wl_surface_damage_buffer(top->surface, 0, 0,
                              top->buf->width, top->buf->height);