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-rw-r--r--gc.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/gc.c b/gc.c
index 6c230d7820..9b218934b4 100644
--- a/gc.c
+++ b/gc.c
@@ -1491,7 +1491,10 @@ internal_object_p(VALUE obj)
case T_ZOMBIE:
break;
case T_CLASS:
- if (!RBASIC(obj)->klass) break;
+ if (obj == rb_mRubyVMFrozenCore)
+ return 1;
+
+ if (!RBASIC_CLASS(obj)) break;
if (RCLASS_SINGLETON_P(obj)) {
return rb_singleton_class_internal_p(obj);
}