From a25404c3057f89e8d1f17a05ef4473b8f1c8fe94 Mon Sep 17 00:00:00 2001
From: "Yukihiro \"Matz\" Matsumoto" <matz@ruby-lang.org>
Date: Wed, 12 Apr 2017 09:18:44 +0900
Subject: The attached object may not be a class; fix #3602

---
 src/class.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/class.c b/src/class.c
index baefe3fde..c7781c9b8 100644
--- a/src/class.c
+++ b/src/class.c
@@ -137,7 +137,15 @@ mrb_class_outer_module(mrb_state *mrb, struct RClass *c)
     mrb_value klass;
     klass = mrb_obj_iv_get(mrb, (struct RObject *)cls,
                            mrb_intern_lit(mrb, "__attached__"));
-    cls = mrb_class_ptr(klass);
+    switch (mrb_type(klass)) {
+    case MRB_TT_CLASS:
+    case MRB_TT_SCLASS:
+    case MRB_TT_MODULE:
+      cls = mrb_class_ptr(klass);
+      break;
+    default:
+      break;
+    }
   }
   return cls;
 }
-- 
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