From f97e27f0c05f325d18d86115d3998cc3755bc7df Mon Sep 17 00:00:00 2001
From: Michael Lumish <mlumish@google.com>
Date: Tue, 16 Jun 2020 11:40:22 -0700
Subject: [PATCH] Fix possible null reference

---
 packages/grpc-js/src/call-credentials-filter.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/grpc-js/src/call-credentials-filter.ts b/packages/grpc-js/src/call-credentials-filter.ts
index a5459b53..5263d97f 100644
--- a/packages/grpc-js/src/call-credentials-filter.ts
+++ b/packages/grpc-js/src/call-credentials-filter.ts
@@ -39,7 +39,7 @@ export class CallCredentialsFilter extends BaseFilter implements Filter {
     if (splitPath.length >= 2) {
       serviceName = splitPath[1];
     }
-    const hostname = splitHostPort(stream.getHost()).host;
+    const hostname = splitHostPort(stream.getHost())?.host ?? 'localhost';
     /* Currently, call credentials are only allowed on HTTPS connections, so we
      * can assume that the scheme is "https" */
     this.serviceUrl = `https://${hostname}/${serviceName}`;