{"action":"created","comment":{"url":"https://api.github.com/repos/GoogleChrome/lighthouse/pulls/comments/73572654","id":73572654,"diff_hunk":"@@ -39,20 +39,23 @@ class CacheStartUrl extends Audit {\n    */\n   static audit(artifacts) {\n     let cacheHasStartUrl = false;\n+    const manifest = artifacts.Manifest && artifacts.Manifest.value;\n+    const cacheContents = artifacts.CacheContents;\n+    const baseURL = artifacts.URL;\n \n-    if (!(artifacts.Manifest &&\n-          artifacts.Manifest.value &&\n-          artifacts.Manifest.value.start_url &&\n-          Array.isArray(artifacts.CacheContents) &&\n-          artifacts.URL)) {\n+    if (!(manifest && manifest.start_url && manifest.start_url.raw)) {","path":"lighthouse-core/audits/cache-start-url.js","position":13,"original_position":13,"commit_id":"269b5a85636e47a37c15f4faacf91d3dd6f5777c","original_commit_id":"269b5a85636e47a37c15f4faacf91d3dd6f5777c","user":{"login":"brendankenny","id":316891,"avatar_url":"https://avatars.githubusercontent.com/u/316891?v=3","gravatar_id":"","url":"https://api.github.com/users/brendankenny","html_url":"https://github.com/brendankenny","followers_url":"https://api.github.com/users/brendankenny/followers","following_url":"https://api.github.com/users/brendankenny/following{/other_user}","gists_url":"https://api.github.com/users/brendankenny/gists{/gist_id}","starred_url":"https://api.github.com/users/brendankenny/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/brendankenny/subscriptions","organizations_url":"https://api.github.com/users/brendankenny/orgs","repos_url":"https://api.github.com/users/brendankenny/repos","events_url":"https://api.github.com/users/brendankenny/events{/privacy}","received_events_url":"https://api.github.com/users/brendankenny/received_events","type":"User","site_admin":false},"body":"can just be `if (!(manifest && manifest.start_url.raw)) {` (if there is a manifest, there is always a `manifest.start_url`)","created_at":"2016-08-04T18:04:37Z","updated_at":"2016-08-04T18:04:37Z","html_url":"https://github.com/GoogleChrome/lighthouse/pull/558#discussion_r73572654","pull_request_url":"https://api.github.com/repos/GoogleChrome/lighthouse/pulls/558","_links":{"self":{"href":"https://api.github.com/repos/GoogleChrome/lighthouse/pulls/comments/73572654"},"html":{"href":"https://github.com/GoogleChrome/lighthouse/pull/558#discussion_r73572654"},"pull_request":{"href":"https://api.github.com/repos/GoogleChrome/lighthouse/pulls/558"}}},"pull_request":{"url":"https://api.github.com/repos/GoogleChrome/lighthouse/pulls/558","id":80121502,"html_url":"https://github.com/GoogleChrome/lighthouse/pull/558","diff_url":"https://github.com/GoogleChrome/lighthouse/pull/558.diff","patch_url":"https://github.com/GoogleChrome/lighthouse/pull/558.patch","issue_url":"https://api.github.com/repos/GoogleChrome/lighthouse/issues/558","number":558,"state":"open","locked":false,"title":"Fix exception on missing manifest start_url","user":{"login":"paulirish","id":39191,"avatar_url":"https://avatars.githubusercontent.com/u/39191?v=3","gravatar_id":"","url":"https://api.github.com/users/paulirish","html_url":"https://github.com/paulirish","followers_url":"https://api.github.com/users/paulirish/followers","following_url":"https://api.github.com/users/paulirish/following{/other_user}","gists_url":"https://api.github.com/users/paulirish/gists{/gist_id}","starred_url":"https://api.github.com/users/paulirish/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/paulirish/subscriptions","organizations_url":"https://api.github.com/users/paulirish/orgs","repos_url":"https://api.github.com/users/paulirish/repos","events_url":"https://api.github.com/users/paulirish/events{/privacy}","received_events_url":"https://api.github.com/users/paulirish/received_events","type":"User","site_admin":false},"body":"This may fix #557, however I was unable to reproduce the exception, even trying a manifest with \"start_url: undefined` and missing the property entirely.\r\n\r\n@surma can you try this 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