diff --git a/packages/insomnia/src/network/url-matches-cert-host.ts b/packages/insomnia/src/network/url-matches-cert-host.ts
index f09921eaba..ff3bd13ef2 100644
--- a/packages/insomnia/src/network/url-matches-cert-host.ts
+++ b/packages/insomnia/src/network/url-matches-cert-host.ts
@@ -6,7 +6,7 @@ const DEFAULT_PORT = 443;
 export function urlMatchesCertHost(certificateHost: string, requestUrl: string, needCheckPort = true) {
   const cHostWithProtocol = setDefaultProtocol(certificateHost, 'https:');
 
-  let hostname: string | null = null;
+  let hostname: string = '';
   let port = '';
   try {
     const parsedUrl = new URL(requestUrl);