From 02a9302f6946040846dc0cf598c9b64e0b363ec2 Mon Sep 17 00:00:00 2001
From: Alex Yang <himself65@outlook.com>
Date: Fri, 11 Aug 2023 04:04:46 -0400
Subject: [PATCH] fix: left might be GC

---
 src/structs/Item.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/structs/Item.js b/src/structs/Item.js
index 7e1bc92c..e4160391 100644
--- a/src/structs/Item.js
+++ b/src/structs/Item.js
@@ -427,9 +427,12 @@ export class Item extends AbstractStruct {
     if (this.parent) {
       if ((!this.left && (!this.right || this.right.left !== null)) || (this.left && this.left.right !== this.right)) {
         /**
-         * @type {Item|null}
+         * @type {GC|Item|null}
          */
         let left = this.left
+        if (left && left.constructor === GC) {
+          left = null
+        }
 
         /**
          * @type {Item|null}