diff --git a/src/bgen/Generator.cs b/src/bgen/Generator.cs
index 5acdfb51ec03..3ac741710e66 100644
--- a/src/bgen/Generator.cs
+++ b/src/bgen/Generator.cs
@@ -2440,6 +2440,8 @@ static string FindNamespace (MemberInfo item)
 	bool IsInSupportedFramework (MemberInfo klass, PlatformName platform)
 	{
 		string ns = FindNamespace (klass);
+		if (string.IsNullOrEmpty (ns))
+			return false;
 		var list = GetFrameworkListForPlatform (platform);
 		return list.Contains (ns.ToLower (CultureInfo.InvariantCulture));
 	}
diff --git a/tests/generator/BGenTests.cs b/tests/generator/BGenTests.cs
index d39b1d860b75..5cb7df715580 100644
--- a/tests/generator/BGenTests.cs
+++ b/tests/generator/BGenTests.cs
@@ -381,6 +381,21 @@ public void Bug39614 (Profile profile)
 			bgen.AssertWarning (1103, "'FooType`1' does not live under a namespace; namespaces are a highly recommended .NET best practice");
 		}
 
+#if !NET
+		[Ignore ("This only applies to .NET")]
+#endif
+		[TestCase (Profile.iOS)]
+		public void Bug18035 (Profile profile)
+		{
+			Configuration.IgnoreIfIgnoredPlatform (profile.AsPlatform ());
+			var bgen = new BGenTool ();
+			bgen.Profile = profile;
+			bgen.AddTestApiDefinition ("bug18025.cs");
+			bgen.CreateTemporaryBinding ();
+			bgen.AssertExecute ("build");
+			bgen.AssertWarning (1103, "'FooType' does not live under a namespace; namespaces are a highly recommended .NET best practice");
+		}
+
 		[Test]
 		public void Bug40282 ()
 		{
diff --git a/tests/generator/bug18025.cs b/tests/generator/bug18025.cs
new file mode 100644
index 000000000000..8336ba366809
--- /dev/null
+++ b/tests/generator/bug18025.cs
@@ -0,0 +1,9 @@
+using System;
+using Foundation;
+
+[BaseType (typeof (NSObject))]
+public interface FooType {
+	[Introduced (PlatformName.iOS, 8, 0)]
+	[Export ("getBar:")]
+	string GetBar (string bar);
+}