function cancelUnregisteringServer(uint _serverIndex) public {
        In3Server storage server = servers[_serverIndex];

        
        require(server.unregisterCaller != address(0) && server.owner == msg.sender, "only the owner is allowed to cancel unregister");

        
        
        if (server.unregisterCaller != server.owner) 
            server.owner.transfer(server.unregisterDeposit);

        
        server.unregisterCaller = address(0);
        server.unregisterTime = 0;
        server.unregisterDeposit = 0;

        
        emit LogServerUnregisterCanceled(server.url, server.owner);
    }