diff --git a/public/i18n/locale-en.json b/public/i18n/locale-en.json
index 9bf6769..1963331 100644
--- a/public/i18n/locale-en.json
+++ b/public/i18n/locale-en.json
@@ -1,7 +1,7 @@
 {
   "ERRORS": {
     "repo_not_found": "The repository is not found.",
-    "repo_not_accessible": "Anonymous GitHub does not have the permission to access the repository.",
+    "repo_not_accessible": "Anonymous GitHub is unable to or is forbidden to access the repository.",
     "repository_expired": "The repository is expired",
     "repository_not_ready": "Anonymous GitHub is still processing the repository, it can take several minutes.",
     "repo_is_updating": "Anonymous GitHub is still processing the repository, it can take several minutes.",
diff --git a/public/script/app.js b/public/script/app.js
index 217d238..6cf02b8 100644
--- a/public/script/app.js
+++ b/public/script/app.js
@@ -1190,8 +1190,9 @@ angular
             }
           },
           (err) => {
-            console.log(err);
-            $scope.files = [];
+            $scope.type = "error";
+            $scope.content = err.data.error;
+            $scope.files = null;
           }
         );
       }
diff --git a/src/source/GitHubStream.ts b/src/source/GitHubStream.ts
index 32801ee..2c42a1c 100644
--- a/src/source/GitHubStream.ts
+++ b/src/source/GitHubStream.ts
@@ -72,12 +72,19 @@ export default class GitHubStream extends GitHubBase implements SourceBase {
     const octokit = new Octokit({
       auth: await this.getToken(),
     });
-    const ghRes = await octokit.git.getTree({
-      owner: this.githubRepository.owner,
-      repo: this.githubRepository.repo,
-      tree_sha: sha,
-      recursive: "1",
-    });
+
+    let ghRes;
+
+    try {
+      ghRes = await octokit.git.getTree({
+        owner: this.githubRepository.owner,
+        repo: this.githubRepository.repo,
+        tree_sha: sha,
+        recursive: "1",
+      });
+    } catch (error) {
+      throw new AnonymousError("repo_not_accessible", this.repository);
+    }
 
     const tree = this.tree2Tree(ghRes.data.tree, truncatedTree, parentPath);
     if (ghRes.data.truncated) {