Fix a missing check

3 years ago · b717be20e0
parent 249f22c215
commit b717be20e0
1 changed files with 1 additions and 1 deletions
--- a/src/lapi.c
+++ b/src/lapi.c
@ -1688,7 +1688,7 @@ LUA_API void lua_upvaluejoin (lua_State *L, int fidx1, int n1,
  ravitype_t t1, t2;
  UpVal **up1 = getupvalref(L, fidx1, n1, &f1, &t1);
  UpVal **up2 = getupvalref(L, fidx2, n2, NULL, &t2);
-  if (t1 == t2) {
+  if (t1 == t2 && *up1 != *up2) {
    luaC_upvdeccount(L, *up1);
    *up1 = *up2;
    (*up1)->refcount++;