diff --git a/lib/har.js b/lib/har.js
index <HASH>..<HASH> 100644
--- a/lib/har.js
+++ b/lib/har.js
@@ -19,7 +19,7 @@ function create(pages) {
     };
     // fill the HAR template each page info
     for (const [pageIndex, page] of pages.entries()) {
-        const pageId = `page_${pageIndex + 1}`;
+        const pageId = `page_${pageIndex + 1}_${String(Math.random()).slice(2)}`;
         const log = parsePage(String(pageId), page.info);
         har.log.pages.push(log.page);
         har.log.entries.push(...log.entries);
Make the 'pageref' field random so to make it easier to merge HARs

As requested in #<I>.