@@ -362,6 +362,10 @@ void AddMethod (MethodDefinition registeredMethod, MethodDefinition implementedM
 		{
 			if (registeredMethod != null)
 				foreach (RegisterAttribute attr in GetRegisterAttributes (registeredMethod)) {
+					// Check for Kotlin-mangled methods that cannot be overridden
+					if (attr.Name.Contains ("-impl") || (attr.Name.Contains ('-') && attr.Name.Length - attr.Name.LastIndexOf ('-') == 8))
+						Diagnostic.Error (4213, LookupSource (implementedMethod), $"Cannot override Kotlin-generated method '{attr.Name}' because it is not a valid Java method name. This method can only be overridden from Kotlin.");
+
 					var msig = new Signature (implementedMethod, attr);
 					if (!registeredMethod.IsConstructor && !methods.Any (m => m.Name == msig.Name && m.Params == msig.Params))
 						methods.Add (msig);
 
@@ -30,6 +30,28 @@ public void ConstructorExceptions ()
 			Assert.AreEqual (4200, e.Code);
 		}
 
+		[Test]
+		public void KotlinInvalidImplRegisterName ()
+		{
+			Action<string, object []> logger = (f, o) => { };
+
+			// Contains invalid [Register] name of "foo-impl"
+			var td = SupportDeclarations.GetTypeDefinition (typeof (KotlinInvalidImplRegisterName));
+			var e = Assert.Throws<XamarinAndroidException> (() => new JavaCallableWrapperGenerator (td, logger));
+			Assert.AreEqual (4209, e.Code);
+		}
+
+		[Test]
+		public void KotlinInvalidHashRegisterName ()
+		{
+			Action<string, object []> logger = (f, o) => { };
+
+			// Contains invalid [Register] name of "KotlinInvalidHashRegisterName"
+			var td = SupportDeclarations.GetTypeDefinition (typeof (KotlinInvalidHashRegisterName));
+			var e = Assert.Throws<XamarinAndroidException> (() => new JavaCallableWrapperGenerator (td, logger));
+			Assert.AreEqual (4209, e.Code);
+		}
+
 		[Test]
 		public void GenerateApplication (
 				[Values (null, "android.app.Application", "android.support.multidex.MultiDexApplication")] string applicationJavaClass
 
@@ -227,6 +227,34 @@ public class OverrideNestedName : Java.Lang.Object
 		}
 	}
 
+	[Register ("Kotlin.InvalidRegisterName")]
+	class KotlinInvalidRegisterName : Java.Lang.Object
+	{
+		[Register ("foo-impl")]
+		public virtual void Foo ()
+		{
+		}
+
+		[Register ("foo-f8k2a13")]
+		public virtual void Bar ()
+		{
+		}
+	}
+
+	[Register ("Kotlin.InvalidRegisterNameSubclass")]
+	class KotlinInvalidImplRegisterName : KotlinInvalidRegisterName
+	{
+		[Register ("foo-impl")]
+		public override void Foo () => base.Foo ();
+	}
+
+	[Register ("Kotlin.InvalidRegisterNameSubclass")]
+	class KotlinInvalidHashRegisterName : KotlinInvalidRegisterName
+	{
+		[Register ("foo-f8k2a13")]
+		public override void Bar () => base.Foo ();
+	}
+
 	[Service (Name = "service.Name")]
 	class ServiceName : Java.Lang.Object
 	{