From a85d707226df44bd359f21dc2ce3224014c33b28 Mon Sep 17 00:00:00 2001
From: Dan Stillman <dstillman@zotero.org>
Date: Sat, 20 Apr 2019 03:28:47 -0400
Subject: [PATCH] Fix double progress meter in DB upgrade overlay

---
 chrome/content/zotero/xpcom/zotero.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/chrome/content/zotero/xpcom/zotero.js b/chrome/content/zotero/xpcom/zotero.js
index b3c058bbdc..440620db28 100644
--- a/chrome/content/zotero/xpcom/zotero.js
+++ b/chrome/content/zotero/xpcom/zotero.js
@@ -1429,8 +1429,12 @@ Services.scriptloader.loadSubScript("resource://zotero/polyfill.js");
 			//let progressMeter = win.ZoteroPane.document.getElementById('zotero-pane-progressmeter');
 			let doc = win.ZoteroPane.document;
 			let container = doc.getElementById('zotero-pane-progressmeter-container');
-			let progressMeter = doc.createElement('progressmeter');
-			progressMeter.id = 'zotero-pane-progressmeter';
+			let id = 'zotero-pane-progressmeter';
+			let progressMeter = doc.getElementById(id);
+			if (!progressMeter) {
+				progressMeter = doc.createElement('progressmeter');
+				progressMeter.id = id;
+			}
 			progressMeter.setAttribute('mode', 'undetermined');
 			if (determinate) {
 				progressMeter.mode = 'determined';