diff --git a/Directory.Build.props b/Directory.Build.props
index 787c5a1..a5d5f12 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -1,5 +1,5 @@
 <Project>
 	<PropertyGroup>
-		<Version>1.9.0-rc</Version>
+		<Version>1.9.0-rc.1</Version>
 	</PropertyGroup>
 </Project>
\ No newline at end of file
diff --git a/ricaun.Nuke/Extensions/GitHubExtension.cs b/ricaun.Nuke/Extensions/GitHubExtension.cs
index aec2e67..964da5c 100644
--- a/ricaun.Nuke/Extensions/GitHubExtension.cs
+++ b/ricaun.Nuke/Extensions/GitHubExtension.cs
@@ -27,13 +27,21 @@ public static bool IsForked(this GitRepository gitRepository)
             if (gitRepository is null)
                 return false;
 
-            var gitHubOwner = gitRepository.GetGitHubOwner();
-            var gitHubName = gitRepository.GetGitHubName();
-            var repository = GitHubTasks.GitHubClient.Repository
-                .Get(gitHubOwner, gitHubName)
-                .Result;
+            try
+            {
+                var gitHubOwner = gitRepository.GetGitHubOwner();
+                var gitHubName = gitRepository.GetGitHubName();
+                var repository = GitHubTasks.GitHubClient.Repository
+                    .Get(gitHubOwner, gitHubName)
+                    .Result;
 
-            return repository.Fork;
+                return repository.Fork;
+            }
+            catch
+            {
+                // Private repository is not forked.
+                return false;
+            }
         }
 
         #region GitHubUtil