diff --git a/src/client.js b/src/client.js
index 52f995e..72a2af7 100644
--- a/src/client.js
+++ b/src/client.js
@@ -524,7 +524,7 @@ export class Saturn {
     // It's a good enough heuristic.
     const entry = performance
       .getEntriesByType('resource')
-      .find((r) => r.name === log.url.href)
+      .find((r) => r.name === log.url?.href)
 
     if (entry) {
       const dnsStart = entry.domainLookupStart