diff --git a/[refs] b/[refs]
index 6c93e40f0ecd..0bb798dd285e 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: cbf8ae32f66a9ceb8907ad9e16663c2a29e48990
+refs/heads/master: 39caa0916ef27cf1da5026eb708a2b8413156f75
diff --git a/trunk/lib/btree.c b/trunk/lib/btree.c
index 5cf9e74ec3f3..f9a484676cb6 100644
--- a/trunk/lib/btree.c
+++ b/trunk/lib/btree.c
@@ -509,6 +509,7 @@ static int btree_insert_level(struct btree_head *head, struct btree_geo *geo,
 int btree_insert(struct btree_head *head, struct btree_geo *geo,
 		unsigned long *key, void *val, gfp_t gfp)
 {
+	BUG_ON(!val);
 	return btree_insert_level(head, geo, key, val, 1, gfp);
 }
 EXPORT_SYMBOL_GPL(btree_insert);