Fixed Buffer.concat error when using symmetric encryption in the browser

CHANGELOG.md

@@ -10,6 +10,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 - **Breaking**: Moved `startTime` and `endTime` for history queries to a `timeFilter` property as both or neither must be passed; passing only one parameter is not supported.
 
+### Fixed
+- Buffer concat error when using symmetric encryption in the browser.
+
 ## [0.11.0] - 2021-08-20
 
 ### Added

src/lib/waku_message/version_1.ts

@@ -147,7 +147,7 @@ export async function encryptSymmetric(
 
   // Returns `cipher | tag`
   const cipher = await symmetric.encrypt(iv, hexToBuf(key), Buffer.from(data));
-  return Buffer.concat([cipher, iv]);
+  return Buffer.concat([cipher, Buffer.from(iv)]);
 }
 
 /**