Fix crash observe on the PlayStore (#341)

CHANGES.md

@@ -12,6 +12,7 @@ Other changes:
 
 Bugfix:
  - Fix regression on permalink click
+ - Fix crash reported by the PlayStore (#341)
 
 Translations:
  -

vector/src/main/java/im/vector/riotx/features/notifications/NotificationDrawerManager.kt

@@ -121,12 +121,14 @@ class NotificationDrawerManager @Inject constructor(private val context: Context
         Timber.v("clearMessageEventOfRoom $roomId")
 
         if (roomId != null) {
+            synchronized(eventList) {
                 eventList.removeAll { e ->
                     if (e is NotifiableMessageEvent) {
                         return@removeAll e.roomId == roomId
                     }
                     return@removeAll false
                 }
+            }
             NotificationUtils.cancelNotificationMessage(context, roomId, ROOM_MESSAGES_NOTIFICATION_ID)
         }
         refreshNotificationDrawer()
@@ -433,6 +435,7 @@ class NotificationDrawerManager @Inject constructor(private val context: Context
 
 
     fun persistInfo() {
+        synchronized(eventList) {
             if (eventList.isEmpty()) {
                 deleteCachedRoomNotifications(context)
                 return
@@ -447,6 +450,7 @@ class NotificationDrawerManager @Inject constructor(private val context: Context
                 Timber.e(e, "## Failed to save cached notification info")
             }
         }
+    }
 
     private fun loadEventInfo(): ArrayList<NotifiableEvent> {
         try {