--- src/utility.c.orig	2002-08-08 18:26:14.000000000 +1000
+++ src/utility.c	2002-08-08 18:17:05.000000000 +1000
@@ -162,7 +162,7 @@
 	}
 
 	/* Trim trailing space. */	
-	while (isspace(s[strlen(s)-1])) {
+	while (strlen(s) && isspace(s[strlen(s)-1])) {
 		s[strlen(s)-1]='\0';
 	}