1 files changed, 1 insertions, 1 deletions
diff --git a/iup/srclua5/il_val.c b/iup/srclua5/il_val.c
index eb6d731..f0420de 100755
--- a/iup/srclua5/il_val.c
+++ b/iup/srclua5/il_val.c
@@ -35,7 +35,7 @@ static int val_button_release_cb(Ihandle *self, double p0)
 
 static int Val(lua_State *L)
 {
-  Ihandle *ih = IupVal((char *) luaL_checkstring(L, 1));
+  Ihandle *ih = IupVal((char *) luaL_optstring(L, 1, NULL));
   iuplua_plugstate(L, ih);
   iuplua_pushihandle_raw(L, ih);
   return 1;