From 42f3ff16348fe0c4bfc433adff69244fd46eaaad Mon Sep 17 00:00:00 2001
From: Shinichiro Oba <bricklife@gmail.com>
Date: Fri, 9 Sep 2022 17:18:02 +0900
Subject: [PATCH] Safety improvements

---
 .../Sources/ScratchLink/Resources/inject-scratch-link.js      | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/ScratchLink/Sources/ScratchLink/Resources/inject-scratch-link.js b/ScratchLink/Sources/ScratchLink/Resources/inject-scratch-link.js
index ca94fa2..05dcaf6 100644
--- a/ScratchLink/Sources/ScratchLink/Resources/inject-scratch-link.js
+++ b/ScratchLink/Sources/ScratchLink/Resources/inject-scratch-link.js
@@ -31,7 +31,9 @@ class ScratchLink {
             socketId: this.socketId
         });
 
-        this.onclose();
+        if (this.onclose) {
+            this.onclose();
+        }
 
         ScratchLink.sockets.delete(this.socketId);
     }