--- ./src/dvdbackup.c~	2009-06-09 07:25:29.000000000 +0900
+++ ./src/dvdbackup.c	2009-07-08 02:27:46.000000000 +0900
@@ -1627,6 +1627,13 @@
 
 	vts_title = titles_info->titles[titles - 1].vts_title;
 
+	if (start_chapter > titles_info->titles[titles - 1].chapters &&
+	    end_chapter > titles_info->titles[titles - 1].chapters) {
+		fprintf(stderr, _("Overflowed the start_chapter; only %d chapters in %d title\n"), start_chapter,titles);
+		fprintf(stderr, _("Overflowed the end_chapter; only %d chapters in %d title\n"), end_chapter,titles);
+		return(1);
+	}
+
 	if (end_chapter > titles_info->titles[titles - 1].chapters) {
 		end_chapter = titles_info->titles[titles - 1].chapters;
 		fprintf(stderr, _("Truncated the end_chapter; only %d chapters in %d title\n"), end_chapter,titles);
@@ -1634,7 +1641,7 @@
 
 	if (start_chapter > titles_info->titles[titles - 1].chapters) {
 		start_chapter = titles_info->titles[titles - 1].chapters;
-		fprintf(stderr, _("Truncated the end_chapter; only %d chapters in %d title\n"), end_chapter,titles);
+		fprintf(stderr, _("Truncated the start_chapter; only %d chapters in %d title\n"), start_chapter,titles);
 	}