ext/oj/mimic_json.c in oj-3.13.13 vs ext/oj/mimic_json.c in oj-3.13.14

@@ -458,10 +458,10 @@
     // instance and not a Hash gives the desired behavior.
     *rargs = *argv;
     if (0 == argc) {
         rb_raise(rb_eArgError, "wrong number of arguments (0))");
     }
-    if (1 == argc) {
+    if (1 == argc || Qnil == argv[1]) {
         h = rb_hash_new();
     } else  {
         h = argv[1];
     }
     if (!oj_hash_has_key(h, oj_indent_sym)) {