diff --git a/OpenRA.Lint/YamlChecker.cs b/OpenRA.Lint/YamlChecker.cs
index 2acded35bd..679f7fbe8c 100644
--- a/OpenRA.Lint/YamlChecker.cs
+++ b/OpenRA.Lint/YamlChecker.cs
@@ -63,6 +63,14 @@ namespace OpenRA.Lint
 
 				foreach (var testMap in maps)
 				{
+					if (testMap.Rules.Count < 1)
+					{
+						if (verbose)
+							Console.WriteLine("No custom rules detected. Omitting Map: {0}".F(testMap.Title));
+
+						continue;
+					}
+
 					if (verbose)
 						Console.WriteLine("Map: {0}".F(testMap.Title));
 					Rules.LoadRules(Game.modData.Manifest, testMap);