From cf6f2ac5075a329c496fe619c7a234939ceef957 Mon Sep 17 00:00:00 2001
From: George Svarovsky <gsvarovsky@gmail.com>
Date: Sun, 27 Dec 2020 10:20:00 +0000
Subject: [PATCH] AsyncIterator _end race condition workaround

---
 lib/get/leveliterator.ts | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/lib/get/leveliterator.ts b/lib/get/leveliterator.ts
index 0a19c16..c71ec82 100644
--- a/lib/get/leveliterator.ts
+++ b/lib/get/leveliterator.ts
@@ -56,13 +56,15 @@ export class LevelIterator extends BufferedIterator<Quad> {
 
 
   protected _end(destroy?: boolean) {
-    super._end(destroy);
-    if (!destroy) {
-      this.level.end((endErr?: Error) => {
-        if (endErr) {
-          this.emit('error', endErr);
-        }
-      });
+    if (!this.ended) {
+      super._end(destroy);
+      if (!destroy) {
+        this.level.end((endErr?: Error) => {
+          if (endErr) {
+            this.emit('error', endErr);
+          }
+        });
+      }
     }
   }