diff --git a/devicemodel/hw/vdisplay_sdl.c b/devicemodel/hw/vdisplay_sdl.c
index 09655eb7a..b8e526d2a 100644
--- a/devicemodel/hw/vdisplay_sdl.c
+++ b/devicemodel/hw/vdisplay_sdl.c
@@ -1151,6 +1151,7 @@ int
 gfx_ui_init()
 {
 	SDL_SysWMinfo info;
+	int num_pscreen;
 
 	setenv("SDL_VIDEO_X11_FORCE_EGL", "1", 1);
 	setenv("SDL_OPENGL_ES_DRIVER", "1", 1);
@@ -1162,6 +1163,14 @@ gfx_ui_init()
 		return -1;
 	}
 
+	num_pscreen = SDL_GetNumVideoDisplays();
+	if (vdpy.pscreen_id >= num_pscreen) {
+		pr_err("Monitor id %d is out of avalble range [0~%d].\n",
+				vdpy.pscreen_id, num_pscreen);
+		SDL_Quit();
+		return -1;
+	}
+
 	SDL_GetDisplayBounds(vdpy.pscreen_id, &vdpy.pscreen_rect);
 
 	if (vdpy.pscreen_rect.w < VDPY_MIN_WIDTH ||