From f301b1f7b48d9448d3837488e6030b6731397e64 Mon Sep 17 00:00:00 2001
From: achingbrain <alex@achingbrain.net>
Date: Fri, 16 Jun 2023 22:49:38 +0200
Subject: [PATCH] chore: fix failing test

---
 packages/libp2p/src/registrar.ts | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/packages/libp2p/src/registrar.ts b/packages/libp2p/src/registrar.ts
index 1c2efbd2c0..9bb4e628f1 100644
--- a/packages/libp2p/src/registrar.ts
+++ b/packages/libp2p/src/registrar.ts
@@ -117,6 +117,10 @@ export class DefaultRegistrar implements Registrar {
    * Register handlers for a set of multicodecs given
    */
   async register (protocol: string, topology: Topology): Promise<string> {
+    if (topology == null) {
+      throw new CodeError('invalid topology', codes.ERR_INVALID_PARAMETERS)
+    }
+
     // Create topology
     const id = `${(Math.random() * 1e9).toString(36)}${Date.now()}`