YOU DONT HAVE PERMISSION TO SHOP FROM (X)

after plugin reload of HumanNPC or GUIshop , mostely human npc the shop working and player buy but after a small while of lets say one hour people start having this perms thing , while no permission is given for thins , any one going through the same issue ?

if (string.IsNullOrEmpty(vendor))
                    return Lang("NoPerm", player.UserIDString, shopKey);
 
//if (string.IsNullOrEmpty(vendor))
                    //return Lang("NoPerm", player.UserIDString, shopKey);