From c3e2d2cfba9813b217d5606607f207449d2e6d20 Mon Sep 17 00:00:00 2001
From: Daniel Gultsch <daniel@gultsch.de>
Date: Mon, 4 Jan 2016 20:14:29 +0100
Subject: added missing synchronize when pushing messages from mam backlog

---
 .../java/eu/siacs/conversations/services/NotificationService.java     | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/main/java/eu/siacs/conversations/services/NotificationService.java b/src/main/java/eu/siacs/conversations/services/NotificationService.java
index 624c0a60..3199b492 100644
--- a/src/main/java/eu/siacs/conversations/services/NotificationService.java
+++ b/src/main/java/eu/siacs/conversations/services/NotificationService.java
@@ -115,7 +115,9 @@ public class NotificationService {
 
 	public void pushFromBacklog(final Message message) {
 		if (notify(message)) {
-			pushToStack(message);
+			synchronized (notifications) {
+				pushToStack(message);
+			}
 		}
 	}
 
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