diff --git a/src/Tgstation.Server.Host/Components/Engine/OpenDreamInstaller.cs b/src/Tgstation.Server.Host/Components/Engine/OpenDreamInstaller.cs
index 5244816ead..a2b74e1445 100644
--- a/src/Tgstation.Server.Host/Components/Engine/OpenDreamInstaller.cs
+++ b/src/Tgstation.Server.Host/Components/Engine/OpenDreamInstaller.cs
@@ -159,7 +159,7 @@ namespace Tgstation.Server.Host.Components.Engine
 					Logger.LogTrace("OD repo seems to already exist, attempting load and fetch...");
 					repo = await repositoryManager.LoadRepository(cancellationToken);
 
-					await repo.FetchOrigin(
+					await repo!.FetchOrigin(
 						progressSection1,
 						null,
 						null,
diff --git a/src/Tgstation.Server.Host/Components/Instance.cs b/src/Tgstation.Server.Host/Components/Instance.cs
index 0973cd9322..0e448251b0 100644
--- a/src/Tgstation.Server.Host/Components/Instance.cs
+++ b/src/Tgstation.Server.Host/Components/Instance.cs
@@ -514,6 +514,9 @@ namespace Tgstation.Server.Host.Components
 						Job compileProcessJob;
 						using (var repo = await RepositoryManager.LoadRepository(cancellationToken))
 						{
+							if (repo == null)
+								throw new JobException(Api.Models.ErrorCode.RepoMissing);
+
 							var deploySha = repo.Head;
 							if (deploySha == null)
 							{
diff --git a/src/Tgstation.Server.Host/Components/Repository/IRepositoryManager.cs b/src/Tgstation.Server.Host/Components/Repository/IRepositoryManager.cs
index 090e3cad82..596301611a 100644
--- a/src/Tgstation.Server.Host/Components/Repository/IRepositoryManager.cs
+++ b/src/Tgstation.Server.Host/Components/Repository/IRepositoryManager.cs
@@ -4,8 +4,6 @@ using System.Threading.Tasks;
 
 using Tgstation.Server.Host.Jobs;
 
-#nullable disable
-
 namespace Tgstation.Server.Host.Components.Repository
 {
 	/// <summary>
@@ -28,25 +26,25 @@ namespace Tgstation.Server.Host.Components.Repository
 		/// </summary>
 		/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation.</param>
 		/// <returns>A <see cref="ValueTask{TResult}"/> resulting in the loaded <see cref="IRepository"/> if it exists, <see langword="null"/> otherwise.</returns>
-		ValueTask<IRepository> LoadRepository(CancellationToken cancellationToken);
+		ValueTask<IRepository?> LoadRepository(CancellationToken cancellationToken);
 
 		/// <summary>
 		/// Clone the repository at <paramref name="url"/>.
 		/// </summary>
 		/// <param name="url">The <see cref="Uri"/> of the remote repository to clone.</param>
-		/// <param name="initialBranch">The branch to clone.</param>
-		/// <param name="username">The username to clone from <paramref name="url"/>.</param>
-		/// <param name="password">The password to clone from <paramref name="url"/>.</param>
+		/// <param name="initialBranch">The optional branch to clone.</param>
+		/// <param name="username">The optional username to clone from <paramref name="url"/>.</param>
+		/// <param name="password">The optional password to clone from <paramref name="url"/>.</param>
 		/// <param name="progressReporter">The optional <see cref="JobProgressReporter"/> for progress of the clone.</param>
 		/// <param name="recurseSubmodules">If submodules should be recusively cloned and initialized.</param>
 		/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation.</param>
 		/// <returns>A <see cref="ValueTask{TResult}"/> resulting i the newly cloned <see cref="IRepository"/>, <see langword="null"/> if one already exists.</returns>
-		ValueTask<IRepository> CloneRepository(
+		ValueTask<IRepository?> CloneRepository(
 			Uri url,
-			string initialBranch,
-			string username,
-			string password,
-			JobProgressReporter progressReporter,
+			string? initialBranch,
+			string? username,
+			string? password,
+			JobProgressReporter? progressReporter,
 			bool recurseSubmodules,
 			CancellationToken cancellationToken);