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-rw-r--r--proc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/proc.c b/proc.c
index d11d167f706..0c8889f04b0 100644
--- a/proc.c
+++ b/proc.c
@@ -3045,7 +3045,7 @@ method_super_method(VALUE method)
TypedData_Get_Struct(method, struct METHOD, &method_data_type, data);
iclass = data->iclass;
if (!iclass) return Qnil;
- if (data->me->def->type == VM_METHOD_TYPE_ALIAS) {
+ if (data->me->def->type == VM_METHOD_TYPE_ALIAS && data->me->defined_class) {
super_class = RCLASS_SUPER(rb_find_defined_class_by_owner(data->me->defined_class,
data->me->def->body.alias.original_me->owner));
mid = data->me->def->body.alias.original_me->def->original_id;