diff --git a/libs/video/renderer/r_screen.c b/libs/video/renderer/r_screen.c
index 86608c069..cabd491cc 100644
--- a/libs/video/renderer/r_screen.c
+++ b/libs/video/renderer/r_screen.c
@@ -288,7 +288,7 @@ SCR_UpdateScreen (transform_t *camera, double realtime, SCR_Func *scr_funcs)
 	if (r_dowarp) {
 		r_funcs->bind_framebuffer (warp_buffer);
 	}
-	if (scr_fisheye->int_val) {
+	if (scr_fisheye->int_val && fisheye_cube_map) {
 		int         side = fisheye_cube_map->width;
 		vrect_t     feye = { 0, 0, side, side };
 		r_funcs->set_viewport (&feye);
diff --git a/libs/video/renderer/vid_render_vulkan.c b/libs/video/renderer/vid_render_vulkan.c
index 2b056e7b1..94ffcc987 100644
--- a/libs/video/renderer/vid_render_vulkan.c
+++ b/libs/video/renderer/vid_render_vulkan.c
@@ -429,13 +429,13 @@ vulkan_end_frame (void)
 static framebuffer_t *
 vulkan_create_cube_map (int size)
 {
-	Sys_Error ("not implemented");
+	return 0;
 }
 
 static framebuffer_t *
 vulkan_create_frame_buffer (int width, int height)
 {
-	Sys_Error ("not implemented");
+	return 0;
 }
 
 static void