diff --git a/src/utils/GitHubHelper.js b/src/utils/GitHubHelper.js
index aab2694..25bd775 100644
--- a/src/utils/GitHubHelper.js
+++ b/src/utils/GitHubHelper.js
@@ -8,12 +8,12 @@ async function request(url, { accessToken } = {}) {
     headers.Authorization = `token ${accessToken}`
   }
   const res = await fetch(url, { headers })
-  if (!res.ok) raiseError(new Error(`Got ${res.statusText} when requesting ${url}`))
   if (res.status === 200) return res.json()
   // for private repo, GitHub api also responses with 404 when unauthorized
-  if (res.status === 404) throw new Error(NOT_FOUND)
+  else if (res.status === 404) throw new Error(NOT_FOUND)
+  else if (!res.ok) raiseError(new Error(`Got ${res.statusText} when requesting ${url}`))
   const content = await res.json()
-  throw new Error(content.message)
+  throw new Error(content && content.message)
 }
 
 async function getRepoMeta({ userName, repoName, accessToken }) {