diff -U 3 -r nut-2.6.0.orig/clients/upsstats.c nut-2.6.0/clients/upsstats.c
--- nut-2.6.0.orig/clients/upsstats.c	2011-02-08 12:51:41 +0200
+++ nut-2.6.0/clients/upsstats.c	2011-02-08 12:54:26 +0200
@@ -351,6 +351,9 @@
 	char	*newups, *newhost;
 	int	newport;
 
+	if (!currups)
+		return;
+
 	/* try to minimize reconnects */
 	if (lastups) {
 
@@ -736,7 +739,8 @@
 			return 1;
 		}
 
-		currups = currups->next;
+		if (currups)
+			currups = currups->next;
 
 		if (currups) {
 			fseek(tf, forofs, SEEK_SET);