luaa: only handle tables in loop check

Signed-off-by: Julien Danjou <julien@danjou.info>

luaa.c

@@ -560,6 +560,8 @@ luaA_hasitem(lua_State *L, const void *item)
  */
 static bool
 luaA_isloop_check(lua_State *L, void_array_t *elems)
+{
+    if(lua_istable(L, -1))
     {
         const void *object = lua_topointer(L, -1);
 
@@ -584,6 +586,7 @@ luaA_isloop_check(lua_State *L, void_array_t *elems)
             /* remove value, keep key for next iteration */
             lua_pop(L, 1);
         }
+    }
     return true;
 }