=== modified file 'kernel/generic/src/adt/avl.c'
--- kernel/generic/src/adt/avl.c	2009-08-04 11:19:19 +0000
+++ kernel/generic/src/adt/avl.c	2011-01-20 14:57:13 +0000
@@ -699,6 +699,10 @@
 static bool _avltree_walk(avltree_node_t *node, avltree_walker_t walker,
     void *arg)
 {
+	if (NULL == node) {
+		return false;
+	}
+
 	if (node->lft) {
 		if (!_avltree_walk(node->lft, walker, arg))
 			return false;