From eb6aec98882b684ec0be8e275b9e566f8b6d3312 Mon Sep 17 00:00:00 2001
From: Christopher Jeffrey <chjjeffrey@gmail.com>
Date: Sat, 27 Aug 2016 15:58:50 -0700
Subject: [PATCH] browser: return error for double end().

---
 lib/db/level.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/db/level.js b/lib/db/level.js
index 3a93b6c2..d4cb8008 100644
--- a/lib/db/level.js
+++ b/lib/db/level.js
@@ -144,6 +144,8 @@ Iterator.prototype.seek = function seek(key) {
 };
 
 Iterator.prototype.end = function end(callback) {
+  if (this._end)
+    return callback(new Error('end() already called on iterator.'));
   this._end = true;
   this.iter.end(callback);
 };