From fa680bbbf5efa5e11941a81ef1b07dd15e034f59 Mon Sep 17 00:00:00 2001
From: Dan Stillman <dstillman@zotero.org>
Date: Sun, 26 Feb 2017 06:12:45 -0500
Subject: [PATCH] Fix startup error on Windows DB upgrades caused by b2b751e0a0

---
 chrome/content/zotero/xpcom/db.js | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/chrome/content/zotero/xpcom/db.js b/chrome/content/zotero/xpcom/db.js
index 22f086cc22..f98c76087f 100644
--- a/chrome/content/zotero/xpcom/db.js
+++ b/chrome/content/zotero/xpcom/db.js
@@ -1064,6 +1064,17 @@ Zotero.DBConnection.prototype.backupDatabase = Zotero.Promise.coroutine(function
 			}
 			return false;
 		}
+		finally {
+			if (connection) {
+				let deferred = Zotero.Promise.defer();
+				connection.asyncClose({
+					complete: function () {
+						deferred.resolve();
+					}
+				});
+				yield deferred.promise;
+			}
+        }
 		
 		// Special backup
 		if (!suffix && numBackups > 1) {