diff --git a/dwl.c b/dwl.c
index 5ab5a0a..7fb1b88 100644
--- a/dwl.c
+++ b/dwl.c
@@ -1578,8 +1578,9 @@ maximizenotify(struct wl_listener *listener, void *data)
 	 * protocol version
 	 * wlr_xdg_surface_schedule_configure() is used to send an empty reply. */
 	Client *c = wl_container_of(listener, c, maximize);
-	if (wl_resource_get_version(c->surface.xdg->toplevel->resource)
-			< XDG_TOPLEVEL_WM_CAPABILITIES_SINCE_VERSION)
+	if (c->surface.xdg->initialized
+			&& wl_resource_get_version(c->surface.xdg->toplevel->resource)
+					< XDG_TOPLEVEL_WM_CAPABILITIES_SINCE_VERSION)
 		wlr_xdg_surface_schedule_configure(c->surface.xdg);
 }