diff --git a/app/Livewire/Project/New/GithubPrivateRepository.php b/app/Livewire/Project/New/GithubPrivateRepository.php
index 59dce3cf59..43c3732464 100644
--- a/app/Livewire/Project/New/GithubPrivateRepository.php
+++ b/app/Livewire/Project/New/GithubPrivateRepository.php
@@ -115,17 +115,22 @@ class GithubPrivateRepository extends Component
             ->where('is_public', false)
             ->whereNotNull('app_id')
             ->findOrFail($github_app_id);
-        $token = generateGithubInstallationToken($this->github_app);
-        $repositories = loadRepositoryByPage($this->github_app, $token, $this->page);
-        $this->total_repositories_count = $repositories['total_count'];
-        $this->repositories = $this->repositories->concat(collect($repositories['repositories']));
-        if ($this->repositories->count() < $this->total_repositories_count) {
+        try {
+            $token = generateGithubInstallationToken($this->github_app);
+            $repositories = loadRepositoryByPage($this->github_app, $token, $this->page);
+            $this->total_repositories_count = $repositories['total_count'];
+            $this->repositories = $this->repositories->concat(collect($repositories['repositories']));
             while ($this->repositories->count() < $this->total_repositories_count) {
                 $this->page++;
                 $repositories = loadRepositoryByPage($this->github_app, $token, $this->page);
                 $this->total_repositories_count = $repositories['total_count'];
                 $this->repositories = $this->repositories->concat(collect($repositories['repositories']));
             }
+        } catch (\Throwable $e) {
+            $this->repositories = collect();
+            handleError($e, $this);
+
+            return;
         }
         $this->repositories = $this->repositories->sortBy('name');
         if ($this->repositories->count() > 0) {
@@ -141,12 +146,17 @@ class GithubPrivateRepository extends Component
         $this->selected_repository_repo = data_get($repository, 'name');
         $this->branches = collect();
         $this->page = 1;
-        $this->loadBranchByPage();
-        if ($this->total_branches_count === 100) {
-            while ($this->total_branches_count === 100) {
-                $this->page++;
+        try {
+            do {
                 $this->loadBranchByPage();
-            }
+                $this->page++;
+            } while ($this->total_branches_count === 100);
+        } catch (\Throwable $e) {
+            $this->branches = collect();
+            $this->total_branches_count = 0;
+            handleError($e, $this);
+
+            return;
         }
         $this->branches = sortBranchesByPriority($this->branches);
         $defaultBranch = data_get($repository, 'default_branch', 'main');
@@ -157,7 +167,7 @@ class GithubPrivateRepository extends Component
         $this->detectRepository();
     }
 
-    protected function loadBranchByPage()
+    protected function loadBranchByPage(): void
     {
         $token = generateGithubInstallationToken($this->github_app);
 
@@ -170,7 +180,9 @@ class GithubPrivateRepository extends Component
             ]);
         $json = $response->json();
         if ($response->status() !== 200) {
-            return $this->dispatch('error', $json['message']);
+            $error = data_get($json, 'message', "HTTP {$response->status()}");
+
+            throw new \RuntimeException("Failed to load branches of {$this->selected_repository_owner}/{$this->selected_repository_repo} with error: ".$error);
         }
 
         $this->total_branches_count = count($json);
diff --git a/bootstrap/helpers/github.php b/bootstrap/helpers/github.php
index edcbca88f6..04eebdb505 100644
--- a/bootstrap/helpers/github.php
+++ b/bootstrap/helpers/github.php
@@ -212,7 +212,7 @@ function generateGithubToken(GithubApp $source, string $type)
             if (! $response->successful()) {
                 $error = data_get($response->json(), 'message', "HTTP {$response->status()}");
                 if ($error === 'Not Found') {
-                    $error = 'Repository not found. Is it moved or deleted?';
+                    $error = "GitHub App installation {$source->installation_id} was not found. Install the GitHub App again or update its installation ID.";
                 }
                 throw new RuntimeException("Failed to get installation token for {$source->name} with error: ".$error);
             }
@@ -388,10 +388,9 @@ function loadRepositoryByPage(GithubApp $source, string $token, int $page)
         ]);
     $json = $response->json();
     if ($response->status() !== 200) {
-        return [
-            'total_count' => 0,
-            'repositories' => [],
-        ];
+        $error = data_get($json, 'message', "HTTP {$response->status()}");
+
+        throw new RuntimeException("Failed to load repositories for {$source->name} with error: ".$error);
     }
 
     if ($json['total_count'] === 0) {
diff --git a/tests/Feature/GithubPrivateRepositoryTest.php b/tests/Feature/GithubPrivateRepositoryTest.php
index 6de13f0c79..de455553a1 100644
--- a/tests/Feature/GithubPrivateRepositoryTest.php
+++ b/tests/Feature/GithubPrivateRepositoryTest.php
@@ -344,6 +344,52 @@ describe('GitHub Private Repository Component', function () {
             ->assertSee('Refresh');
     });
 
+    test('loadRepositories shows an error when the installation is not found', function () {
+        Http::fake([
+            'https://api.github.com/zen' => Http::response('Keep it logically awesome.', 200, [
+                'Date' => now()->toRfc7231String(),
+            ]),
+            'https://api.github.com/app/installations/67890/access_tokens' => Http::response(['message' => 'Not Found'], 404),
+        ]);
+
+        Livewire::test(GithubPrivateRepository::class, ['type' => 'private-gh-app'])
+            ->call('loadRepositories', $this->githubApp->id)
+            ->assertDispatched('error', fn (string $event, array $params) => str_contains($params[0], 'installation 67890 was not found'))
+            ->assertSet('current_step', 'github_apps');
+    });
+
+    test('loadRepositories shows the GitHub error when listing repositories fails', function () {
+        Http::fake([
+            'https://api.github.com/zen' => Http::response('Keep it logically awesome.', 200, [
+                'Date' => now()->toRfc7231String(),
+            ]),
+            'https://api.github.com/app/installations/67890/access_tokens' => Http::response([
+                'token' => 'fake-installation-token',
+            ], 201),
+            'https://api.github.com/installation/repositories*' => Http::response(['message' => 'Resource not accessible by integration'], 403),
+        ]);
+
+        Livewire::test(GithubPrivateRepository::class, ['type' => 'private-gh-app'])
+            ->call('loadRepositories', $this->githubApp->id)
+            ->assertDispatched('error', fn (string $event, array $params) => str_contains($params[0], 'Resource not accessible by integration'))
+            ->assertSet('current_step', 'github_apps');
+    });
+
+    test('loadBranches stops and shows the GitHub error when a later branch page fails', function () {
+        $repository = ['id' => 1, 'name' => 'alpha-repo', 'owner' => ['login' => 'testuser']];
+        fakeGithubHttp([$repository]);
+        Http::fake([
+            'https://api.github.com/repos/testuser/alpha-repo/branches*' => Http::sequence()
+                ->push(collect(range(1, 100))->map(fn (int $i) => ['name' => "branch-{$i}"])->all(), 200)
+                ->whenEmpty(Http::response(['message' => 'API rate limit exceeded'], 403)),
+        ]);
+
+        Livewire::test(GithubPrivateRepository::class, ['type' => 'private-gh-app'])
+            ->call('loadRepositories', $this->githubApp->id)
+            ->call('loadBranches')
+            ->assertDispatched('error', fn (string $event, array $params) => str_contains($params[0], 'API rate limit exceeded'));
+    });
+
     test('refresh button is not visible before repositories are loaded', function () {
         Livewire::test(GithubPrivateRepository::class, ['type' => 'private-gh-app'])
             ->assertDontSee('Refresh');