From be1b7f7468ffc1540c7fd978114a70be1615dc79 Mon Sep 17 00:00:00 2001
From: Joffrey JAFFEUX <j.jaffeux@gmail.com>
Date: Thu, 23 Apr 2020 16:50:30 +0200
Subject: [PATCH] FIX: fails gracefully if :scope is not handled by a browser
 (#9529)

---
 .../discourse/app/initializers/copy-codeblocks.js    | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/app/assets/javascripts/discourse/app/initializers/copy-codeblocks.js b/app/assets/javascripts/discourse/app/initializers/copy-codeblocks.js
index f7e81af46a0..62552f60b93 100644
--- a/app/assets/javascripts/discourse/app/initializers/copy-codeblocks.js
+++ b/app/assets/javascripts/discourse/app/initializers/copy-codeblocks.js
@@ -113,9 +113,15 @@ export default {
           return;
         }
 
-        const commands = postElements[0].querySelectorAll(
-          ":scope > pre > code, :scope :not(article):not(blockquote) > pre > code"
-        );
+        let commands = [];
+        try {
+          commands = postElements[0].querySelectorAll(
+            ":scope > pre > code, :scope :not(article):not(blockquote) > pre > code"
+          );
+        } catch (e) {
+          // :scope is probably not supported by this browser
+          commands = [];
+        }
 
         const post = helper.getModel();