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-rw-r--r--src/ltablib.js2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/ltablib.js b/src/ltablib.js
index 788e236..aaadfd7 100644
--- a/src/ltablib.js
+++ b/src/ltablib.js
@@ -130,7 +130,7 @@ const tmove = function(L) {
const tconcat = function(L) {
let last = aux_getn(L, 1, TAB_R);
- let sep = lauxlib.luaL_optlstring(L, 2, "");
+ let sep = lauxlib.luaL_optlstring(L, 2, []);
let i = lauxlib.luaL_optinteger(L, 3, 1);
last = lauxlib.luaL_optinteger(L, 4, last);