diff --git a/ui/sdl2.c b/ui/sdl2.c
index f76ee1081f..53dd447fd2 100644
--- a/ui/sdl2.c
+++ b/ui/sdl2.c
@@ -804,6 +804,7 @@ void sdl_display_init(DisplayState *ds, int full_screen, int no_frame)
     sdl2_console = g_new0(struct sdl2_console, sdl2_num_outputs);
     for (i = 0; i < sdl2_num_outputs; i++) {
         QemuConsole *con = qemu_console_lookup_by_index(i);
+        assert(con != NULL);
         if (!qemu_console_is_graphic(con)) {
             sdl2_console[i].hidden = true;
         }