diff --git a/[refs] b/[refs]
index 46b21625913e..49860e4f0c4d 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 45ea6095c8f0d6caad5658306416a5d254f1205e
+refs/heads/master: 917c16b2b69fc2eeb432eabca73258f08c58361e
diff --git a/trunk/fs/btrfs/inode.c b/trunk/fs/btrfs/inode.c
index 9d0eaa57d4ee..f60e2490bd0d 100644
--- a/trunk/fs/btrfs/inode.c
+++ b/trunk/fs/btrfs/inode.c
@@ -6529,14 +6529,16 @@ static int btrfs_truncate(struct inode *inode)
 		ret = btrfs_orphan_del(NULL, inode);
 	}
 
-	trans->block_rsv = &root->fs_info->trans_block_rsv;
-	ret = btrfs_update_inode(trans, root, inode);
-	if (ret && !err)
-		err = ret;
+	if (trans) {
+		trans->block_rsv = &root->fs_info->trans_block_rsv;
+		ret = btrfs_update_inode(trans, root, inode);
+		if (ret && !err)
+			err = ret;
 
-	nr = trans->blocks_used;
-	ret = btrfs_end_transaction_throttle(trans, root);
-	btrfs_btree_balance_dirty(root, nr);
+		nr = trans->blocks_used;
+		ret = btrfs_end_transaction_throttle(trans, root);
+		btrfs_btree_balance_dirty(root, nr);
+	}
 
 out:
 	btrfs_free_block_rsv(root, rsv);