Make lua_concat() work from C hook with partial frame.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/lj_api.c b/src/lj_api.c
index 6c129164..b807900d 100644
--- a/src/lj_api.c
+++ b/src/lj_api.c
@@ -709,7 +709,7 @@ LUA_API void lua_concat(lua_State *L, int n)
   if (n >= 2) {
     n--;
     do {
-      TValue *top = lj_meta_cat(L, L->top-1, n);
+      TValue *top = lj_meta_cat(L, L->top-1, -n);
       if (top == NULL) {
         L->top -= n;
         break;