--- a/display.c
+++ b/display.c
@@ -783,7 +783,7 @@ _rl_optimize_redisplay (void)
 
 /* Useful shorthand used by rl_redisplay, update_line, rl_move_cursor_relative */
 #define INVIS_FIRST()	(local_prompt_invis_chars[0])
-#define WRAP_OFFSET(line, offset)  ((line <= prompt_last_screen_line) ? local_prompt_invis_chars[line] : 0)
+#define WRAP_OFFSET(line, offset)  ((line <= prompt_last_screen_line && local_prompt_invis_chars) ? local_prompt_invis_chars[line] : 0)
 
 #define W_OFFSET(line, offset) ((line) == 0 ? offset : 0)
 #define VIS_LLEN(l)	((l) > _rl_vis_botlin ? 0 : (vis_lbreaks[l+1] - vis_lbreaks[l]))