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-rw-r--r--src/lapi.js8
1 files changed, 7 insertions, 1 deletions
diff --git a/src/lapi.js b/src/lapi.js
index 9dbebad..46c7e2b 100644
--- a/src/lapi.js
+++ b/src/lapi.js
@@ -473,7 +473,13 @@ const lua_createtable = function(L, narray, nrec) {
};
const lua_newuserdata = function(L, size) {
- L.stack[L.top++] = new lobject.TValue(CT.LUA_TUSERDATA, new ArrayBuffer(size));
+ let box;
+ if (typeof size == "number")
+ box = new ArrayBuffer(size);
+ else // if size is not passed, create a new empty object
+ box = Object.create(null);
+
+ L.stack[L.top++] = new lobject.TValue(CT.LUA_TUSERDATA, box);
assert(L.top <= L.ci.top, "stack overflow");