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-rw-r--r--src/main/java/eu/siacs/conversations/services/NotificationService.java4
1 files changed, 3 insertions, 1 deletions
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);
+ }
}
}