From 4401012312260c0758906aa739d4de6cec3229cc Mon Sep 17 00:00:00 2001
From: Bruno Windels <brunow@matrix.org>
Date: Thu, 3 Sep 2020 15:30:54 +0200
Subject: [PATCH] no need to call decrypt when there are no events

---
 src/matrix/DeviceMessageHandler.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/matrix/DeviceMessageHandler.js b/src/matrix/DeviceMessageHandler.js
index 9c81f11e..537b948d 100644
--- a/src/matrix/DeviceMessageHandler.js
+++ b/src/matrix/DeviceMessageHandler.js
@@ -64,6 +64,9 @@ export class DeviceMessageHandler {
         }
         const readTxn = await this._storage.readTxn([this._storage.storeNames.session]);
         const pendingEvents = await this._getPendingEvents(readTxn);
+        if (pendingEvents.length === 0) {
+           return;
+        }
         // only know olm for now
         const olmEvents = pendingEvents.filter(e => e.content?.algorithm === OLM_ALGORITHM);
         const decryptChanges = await this._olmDecryption.decryptAll(olmEvents);