diff --git a/src/Tgstation.Server.Host/Components/StaticFiles/IConfiguration.cs b/src/Tgstation.Server.Host/Components/StaticFiles/IConfiguration.cs
index 63b940d646..db32cc1c2b 100644
--- a/src/Tgstation.Server.Host/Components/StaticFiles/IConfiguration.cs
+++ b/src/Tgstation.Server.Host/Components/StaticFiles/IConfiguration.cs
@@ -8,8 +8,6 @@ using Tgstation.Server.Api.Models.Response;
 using Tgstation.Server.Host.Components.Events;
 using Tgstation.Server.Host.Security;
 
-#nullable disable
-
 namespace Tgstation.Server.Host.Components.StaticFiles
 {
 	/// <summary>
@@ -24,7 +22,7 @@ namespace Tgstation.Server.Host.Components.StaticFiles
 		/// <param name="destination">Path to the destination folder.</param>
 		/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation.</param>
 		/// <returns>A <see cref="ValueTask{TResult}"/> resulting in the <see cref="ServerSideModifications"/> if any.</returns>
-		ValueTask<ServerSideModifications> CopyDMFilesTo(string dmeFile, string destination, CancellationToken cancellationToken);
+		ValueTask<ServerSideModifications?> CopyDMFilesTo(string dmeFile, string destination, CancellationToken cancellationToken);
 
 		/// <summary>
 		/// Symlinks all directories in the GameData directory to <paramref name="destination"/>.
@@ -41,7 +39,7 @@ namespace Tgstation.Server.Host.Components.StaticFiles
 		/// <param name="systemIdentity">The <see cref="ISystemIdentity"/> for the operation. If <see langword="null"/>, the operation will be performed as the user of the <see cref="Core.Application"/>.</param>
 		/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation.</param>
 		/// <returns>A <see cref="ValueTask{TResult}"/> resulting in an <see cref="IOrderedQueryable{T}"/> of the <see cref="ConfigurationFileResponse"/>s for the items in the directory. <see cref="FileTicketResponse.FileTicket"/> and <see cref="IConfigurationFile.LastReadHash"/> will both be <see langword="null"/>. <see langword="null"/> will be returned if the operation failed due to access contention.</returns>
-		ValueTask<IOrderedQueryable<ConfigurationFileResponse>> ListDirectory(string configurationRelativePath, ISystemIdentity systemIdentity, CancellationToken cancellationToken);
+		ValueTask<IOrderedQueryable<ConfigurationFileResponse>> ListDirectory(string? configurationRelativePath, ISystemIdentity? systemIdentity, CancellationToken cancellationToken);
 
 		/// <summary>
 		/// Reads a given <paramref name="configurationRelativePath"/>.
@@ -50,7 +48,7 @@ namespace Tgstation.Server.Host.Components.StaticFiles
 		/// <param name="systemIdentity">The <see cref="ISystemIdentity"/> for the operation. If <see langword="null"/>, the operation will be performed as the user of the <see cref="Core.Application"/>.</param>
 		/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation.</param>
 		/// <returns>A <see cref="ValueTask{TResult}"/> resulting in the <see cref="ConfigurationFileResponse"/> of the file. <see langword="null"/> will be returned if the operation failed due to access contention.</returns>
-		ValueTask<ConfigurationFileResponse> Read(string configurationRelativePath, ISystemIdentity systemIdentity, CancellationToken cancellationToken);
+		ValueTask<ConfigurationFileResponse?> Read(string configurationRelativePath, ISystemIdentity? systemIdentity, CancellationToken cancellationToken);
 
 		/// <summary>
 		/// Create an empty directory at <paramref name="configurationRelativePath"/>.
@@ -59,7 +57,7 @@ namespace Tgstation.Server.Host.Components.StaticFiles
 		/// <param name="systemIdentity">The <see cref="ISystemIdentity"/> for the operation. If <see langword="null"/>, the operation will be performed as the user of the <see cref="Core.Application"/>.</param>
 		/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation. Usage may result in partial writes.</param>
 		/// <returns>A <see cref="ValueTask{TResult}"/> resulting in <see langword="true"/> if the directory already existed, <see langword="false"/> otherwise. <see langword="null"/> will be returned if the operation failed due to access contention.</returns>
-		ValueTask<bool?> CreateDirectory(string configurationRelativePath, ISystemIdentity systemIdentity, CancellationToken cancellationToken);
+		ValueTask<bool?> CreateDirectory(string configurationRelativePath, ISystemIdentity? systemIdentity, CancellationToken cancellationToken);
 
 		/// <summary>
 		/// Attempt to delete an empty directory at <paramref name="configurationRelativePath"/>.
@@ -68,7 +66,7 @@ namespace Tgstation.Server.Host.Components.StaticFiles
 		/// <param name="systemIdentity">The <see cref="ISystemIdentity"/> for the operation. If <see langword="null"/>, the operation will be performed as the user of the <see cref="Core.Application"/>.</param>
 		/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation.</param>
 		/// <returns>A <see cref="ValueTask{TResult}"/> resulting in <see langword="true"/> if the directory was empty and deleted, <see langword="false"/> otherwise. <see langword="null"/> will be returned if the operation failed due to access contention.</returns>
-		ValueTask<bool?> DeleteDirectory(string configurationRelativePath, ISystemIdentity systemIdentity, CancellationToken cancellationToken);
+		ValueTask<bool?> DeleteDirectory(string configurationRelativePath, ISystemIdentity? systemIdentity, CancellationToken cancellationToken);
 
 		/// <summary>
 		/// Writes to a given <paramref name="configurationRelativePath"/>.
@@ -78,6 +76,6 @@ namespace Tgstation.Server.Host.Components.StaticFiles
 		/// <param name="previousHash">The hash any existing file must match in order for the write to succeed.</param>
 		/// <param name="cancellationToken">The <see cref="CancellationToken"/> for the operation. Usage may result in partial writes.</param>
 		/// <returns>A <see cref="ValueTask{TResult}"/> resulting in the updated <see cref="ConfigurationFileResponse"/> and associated writing <see cref="FileTicketResponse"/>. <see langword="null"/> will be returned if the operation failed due to access contention.</returns>
-		ValueTask<ConfigurationFileResponse> Write(string configurationRelativePath, ISystemIdentity systemIdentity, string previousHash, CancellationToken cancellationToken);
+		ValueTask<ConfigurationFileResponse?> Write(string configurationRelativePath, ISystemIdentity? systemIdentity, string? previousHash, CancellationToken cancellationToken);
 	}
 }
diff --git a/src/Tgstation.Server.Host/Controllers/ConfigurationController.cs b/src/Tgstation.Server.Host/Controllers/ConfigurationController.cs
index 1df1fbc907..8232be095c 100644
--- a/src/Tgstation.Server.Host/Controllers/ConfigurationController.cs
+++ b/src/Tgstation.Server.Host/Controllers/ConfigurationController.cs
@@ -84,7 +84,7 @@ namespace Tgstation.Server.Host.Controllers
 						var newFile = await instance
 							.Configuration
 							.Write(
-								model.Path,
+								model.Path!,
 								systemIdentity,
 								model.LastReadHash,
 								cancellationToken);
@@ -240,6 +240,9 @@ namespace Tgstation.Server.Host.Controllers
 		{
 			ArgumentNullException.ThrowIfNull(model);
 
+			if (model.Path == null)
+				return BadRequest(new ErrorMessageResponse(ErrorCode.ModelValidationFailure));
+
 			if (ForbidDueToModeConflicts(model.Path, out var systemIdentity))
 				return Forbid();