public VerboseListener unregisterListener(Sender sender) {
        // immediately flush, so the listener gets all current data
        flush();

        return this.listeners.remove(sender.getUniqueId());
    }
Removes a listener for a given player

@param sender the sender
@return the existing listener, if one was actually registered
common/src/main/java/me/lucko/luckperms/common/verbose/VerboseHandler.java