From 185dac6953894e386502acbe42794b6d62c46f8b Mon Sep 17 00:00:00 2001
From: Daniel Gultsch <daniel@gultsch.de>
Date: Sun, 7 May 2017 15:47:18 +0200
Subject: [PATCH] synchronize around adding query to query map

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

diff --git a/src/main/java/eu/siacs/conversations/services/MessageArchiveService.java b/src/main/java/eu/siacs/conversations/services/MessageArchiveService.java
index 7a77e2c64..d9577ea70 100644
--- a/src/main/java/eu/siacs/conversations/services/MessageArchiveService.java
+++ b/src/main/java/eu/siacs/conversations/services/MessageArchiveService.java
@@ -75,7 +75,9 @@ public class MessageArchiveService implements OnAdvancedStreamFeaturesLoaded {
 			query = new Query(account, startCatchup, endCatchup);
 			query.reference = reference;
 		}
-		this.queries.add(query);
+		synchronized (this.queries) {
+			this.queries.add(query);
+		}
 		this.execute(query);
 	}