From c4a4ac3278267f74ac80aaf59fff343a1571305e Mon Sep 17 00:00:00 2001
From: Leon Chen <lchen3@gmail.com>
Date: Sat, 24 Oct 2015 22:14:16 -0400
Subject: [PATCH] check for db.db as db.db.approximateSize not exposed with
 multilevel

---
 lib/queryplanner.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/queryplanner.js b/lib/queryplanner.js
index e1862cf..6df9301 100644
--- a/lib/queryplanner.js
+++ b/lib/queryplanner.js
@@ -48,7 +48,7 @@ function queryplanner(db, options) {
       var newq = queryMask(q)
         , range = utilities.createQuery(newq);
 
-      if (db.db.approximateSize) {
+      if (db.db && db.db.approximateSize) {
         db.db.approximateSize(range.start, range.end, function(err, size) {
           if (err) {
             size = Object.keys(variablesMask(q)).length;