1 files changed, 1 insertions, 0 deletions

diff --git a/lvm.c b/lvm.c
index 73d7ee43..074ee718 100644
--- a/lvm.c
+++ b/lvm.c
@@ -1590,6 +1590,7 @@ void luaV_execute (lua_State *L, CallInfo *ci) {
       }
       vmcase(OP_CLOSE) {
         StkId ra = RA(i);
+        lua_assert(!GETARG_B(i));  /* 'close must be alive */
         Protect(luaF_close(L, ra, LUA_OK, 1));
         vmbreak;
       }