diff --git a/UnityXrefMaps/Commands/BuildCommand.cs b/UnityXrefMaps/Commands/BuildCommand.cs
index 6399abd..7aa1a18 100644
--- a/UnityXrefMaps/Commands/BuildCommand.cs
+++ b/UnityXrefMaps/Commands/BuildCommand.cs
@@ -149,7 +149,7 @@ public BuildCommand(ILoggerFactory loggerFactory)
                     logger.LogInformation("Running DocFX on '{RepositoryTag}'", repositoryTag);
                 }
 
-                await Utils.RunCommand(
+                int exitCode = await Utils.RunCommand(
                     "docfx", docFxArguments,
                     value =>
                     {
@@ -173,6 +173,18 @@ await Utils.RunCommand(
                     },
                     cancellationToken);
 
+                if (exitCode != 0)
+                {
+                    result = false;
+
+                    if (logger.IsEnabled(LogLevel.Error))
+                    {
+                        logger.LogError("DocFX exited with code {ExitCode} for Unity '{RepositoryTag}'", exitCode, repositoryTag);
+                    }
+
+                    continue;
+                }
+
                 if (!File.Exists(generatedXrefMapPath))
                 {
                     result = false;
diff --git a/UnityXrefMaps/Utils.cs b/UnityXrefMaps/Utils.cs
index 8b88a27..6e49723 100644
--- a/UnityXrefMaps/Utils.cs
+++ b/UnityXrefMaps/Utils.cs
@@ -39,7 +39,7 @@ public static async Task CopyFile(string sourcePath, string destPath, Cancellati
     /// <param name="arguments">The arguments of the command.</param>
     /// <param name="output">The function to call with the output data of the command.</param>
     /// <param name="error">The function to call with the error data of the command.</param>
-    public static async Task RunCommand(string command, string arguments, Action<string?> output, Action<string?> error, CancellationToken cancellationToken = default)
+    public static async Task<int> RunCommand(string command, string arguments, Action<string?> output, Action<string?> error, CancellationToken cancellationToken = default)
     {
         using var process = new Process();
         process.StartInfo = new ProcessStartInfo(command, arguments)
@@ -58,6 +58,8 @@ public static async Task RunCommand(string command, string arguments, Action<str
         process.BeginErrorReadLine();
 
         await process.WaitForExitAsync(cancellationToken);
+
+        return process.ExitCode;
     }
 
     /// <summary>