diff --git a/lib/plugins/browsertime/aggregator.js b/lib/plugins/browsertime/aggregator.js
index d3dd3b573..8b96ff60f 100644
--- a/lib/plugins/browsertime/aggregator.js
+++ b/lib/plugins/browsertime/aggregator.js
@@ -35,12 +35,14 @@ module.exports = {
     });
 
     forEach(browsertimeRunData.timings.navigationTiming, (value, name) => {
-      statsHelpers.pushGroupStats(
-        this.statsPerType,
-        this.groups[group],
-        ['navigationTiming', name],
-        value
-      );
+      if (value) {
+        statsHelpers.pushGroupStats(
+          this.statsPerType,
+          this.groups[group],
+          ['navigationTiming', name],
+          value
+        );
+      }
     });
 
     // pick up one level of custom metrics