diff --git a/index.js b/index.js
index 647d722..2f1d761 100644
--- a/index.js
+++ b/index.js
@@ -77,13 +77,21 @@ export function harFromMessages(messages, options) {
     responsesWithoutPage = [],
     paramsWithoutPage = [],
     responseReceivedExtraInfos = [],
+    mainFrameId,
     currentPageId;
 
   for (const message of messages) {
     const params = message.params;
-
     const method = message.method;
 
+    if (
+      method === 'Network.requestWillBeSent' &&
+      params.type === 'Document' &&
+      !mainFrameId
+    ) {
+      mainFrameId = params.frameId;
+    }
+
     if (!/^(Page|Network)\..+/.test(method)) {
       continue;
     }
@@ -94,7 +102,13 @@ export function harFromMessages(messages, options) {
       case 'Page.navigatedWithinDocument': {
         {
           const frameId = params.frameId;
-          const rootFrame = rootFrameMappings.get(frameId) || frameId;
+          const rootFrame = rootFrameMappings.get(frameId) ?? frameId;
+
+          // Skip any iframe
+          if (mainFrameId && rootFrame !== mainFrameId) {
+            break;
+          }
+
           if (pages.some(page => page.__frameId === rootFrame)) {
             continue;
           }