diff --git a/lib/mongo/mongo.rb b/lib/mongo/mongo.rb
index aff8b2f..618090d 100644
--- a/lib/mongo/mongo.rb
+++ b/lib/mongo/mongo.rb
@@ -102,7 +102,7 @@ module XGen
             raise "error retrieving database info" unless db.ok?(doc)
             doc
           ensure
-            db.close
+            db.close if db
           end
         end