From 062c6c542142ca1119d2e767ea4c8eab6b6403f1 Mon Sep 17 00:00:00 2001
From: Hugh Nimmo-Smith <hughns@element.io>
Date: Mon, 23 Sep 2024 12:32:12 +0100
Subject: [PATCH] Handle case of encryption key for an index to be undefined

As per https://github.com/matrix-org/matrix-js-sdk/pull/4423 the key can be undefined and so we should handle this rather than waiting for SubtleCrypto.importKey() to fail.
---
 src/e2ee/matrixKeyProvider.ts | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/e2ee/matrixKeyProvider.ts b/src/e2ee/matrixKeyProvider.ts
index d84c3684c..634dbd6b1 100644
--- a/src/e2ee/matrixKeyProvider.ts
+++ b/src/e2ee/matrixKeyProvider.ts
@@ -41,7 +41,9 @@ export class MatrixKeyProvider extends BaseKeyProvider {
       encryptionKeys,
     ] of this.rtcSession.getEncryptionKeys()) {
       for (const [index, encryptionKey] of encryptionKeys.entries()) {
-        this.onEncryptionKeyChanged(encryptionKey, index, participant);
+        if (encryptionKey) {
+          this.onEncryptionKeyChanged(encryptionKey, index, participant);
+        }
       }
     }
   }