From 667da96c970283cbf0fc2b3672fba3812886be65 Mon Sep 17 00:00:00 2001
From: "jeremy@jermolene.com" <jeremy@jermolene.com>
Date: Sun, 31 Jul 2022 15:35:14 +0100
Subject: [PATCH] Fix crash when closing plugin library

Fixes #6855
---
 core/modules/startup/browser-messaging.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/core/modules/startup/browser-messaging.js b/core/modules/startup/browser-messaging.js
index 25aae9a92..733041e45 100644
--- a/core/modules/startup/browser-messaging.js
+++ b/core/modules/startup/browser-messaging.js
@@ -62,12 +62,14 @@ function loadIFrame(url,callback) {
 Unload library iframe for given url
 */
 function unloadIFrame(url){
-	$tw.utils.each(document.getElementsByTagName('iframe'), function(iframe) {
+	var iframes = document.getElementsByTagName('iframe');
+	for(var t=iframes.length-1; t--; t>=0) {
+		var iframe = iframes[t];
 		if(iframe.getAttribute("library") === "true" &&
 		  iframe.getAttribute("src") === url) {
 			iframe.parentNode.removeChild(iframe);
 		}
-	});
+	}
 }
 
 function saveIFrameInfoTiddler(iframeInfo) {