diff -ruN a/lua-cjson-2.1.0.8/lua_cjson.c b/lua-cjson-2.1.0.8/lua_cjson.c
--- a/lua-cjson-2.1.0.8/lua_cjson.c	2022-01-11 15:11:17.495464192 +0800
+++ b/lua-cjson-2.1.0.8/lua_cjson.c	2022-01-11 14:58:55.150669748 +0800
@@ -796,7 +796,7 @@
     case LUA_TLIGHTUSERDATA:
         if (lua_touserdata(l, -1) == NULL) {
             strbuf_append_mem(json, "null", 4);
-        } else if (lua_touserdata(l, -1) == &json_array) {
+        } else if (lua_touserdata(l, -1) == json_lightudata_mask(&json_array)) {
             json_append_array(l, cfg, current_depth, json, 0);
         }
         break;