diff --git a/lib/runner.js b/lib/runner.js
index 587eea4..f360802 100644
--- a/lib/runner.js
+++ b/lib/runner.js
@@ -154,13 +154,13 @@ async function _executeTest(url, options) {
 
 
     // Safe property access
-    const getScore = (cat) => (lhr.categories[cat] && lhr.categories[cat].score) ? lhr.categories[cat].score * 100 : 0;
-    const getMetric = (aud) => (lhr.audits[aud] && lhr.audits[aud].numericValue) ? lhr.audits[aud].numericValue : 0;
+    const getScore = (cat) => (lhr.categories && lhr.categories[cat] && lhr.categories[cat].score) ? lhr.categories[cat].score * 100 : 0;
+    const getMetric = (aud) => (lhr.audits && lhr.audits[aud] && lhr.audits[aud].numericValue) ? lhr.audits[aud].numericValue : 0;
 
     const summary = {
       id: testId,
-      url: lhr.finalUrl,
-      timestamp: lhr.fetchTime,
+      url: lhr.finalUrl || url,
+      timestamp: lhr.fetchTime || new Date().toISOString(),
       scores: {
         performance: getScore('performance'),
         accessibility: getScore('accessibility'),
@@ -225,8 +225,8 @@ async function _executeTest(url, options) {
 
     const summary = {
       id: testId,
-      url: lhr.finalUrl,
-      timestamp: lhr.fetchTime,
+      url: lhr.finalUrl || url,
+      timestamp: lhr.fetchTime || new Date().toISOString(),
       scores: {
         performance: getScore('performance'),
         accessibility: getScore('accessibility'),