1 files changed, 1 insertions, 0 deletions
diff --git a/variable.c b/variable.c
index 966e4877ce..6d5659260c 100644
--- a/variable.c
+++ b/variable.c
@@ -923,6 +923,7 @@ rb_obj_instance_variables(obj)
 	}
 	return ary;
       default:
+	if (!generic_iv_tbl) return Qnil;
 	if (FL_TEST(obj, FL_EXIVAR) || rb_special_const_p(obj)) {
 	    st_table *tbl;