Server:destroy function is unreliable

[q962]

Uncaught Error: [string "bundle:/deps/stream/stream_readable.lua"]:810: attempt to index global 'process' (a nil value)
stack traceback:
        [string "bundle:/deps/stream/stream_readable.lua"]:810: in function 'resume'
        [string "bundle:/deps/stream/stream_readable.lua"]:802: in function 'resume'
        [string "bundle:/deps/net.lua"]:183: in function 'resume'
        [string "bundle:/deps/stream/stream_readable.lua"]:767: in function 'on'
        [string "bundle:/deps/http.lua"]:290: in function 'handler'
        [string "bundle:/deps/core.lua"]:248: in function 'emit'
        [string "bundle:/deps/net.lua"]:331: in function 'handler'
        [string "bundle:/deps/core.lua"]:248: in function 'emit'
        [string "bundle:/deps/net.lua"]:280: in function <[string "bundle:/deps/net.lua"]:276>
        [C]: in function 'close'
        [string "bundle:/deps/net.lua"]:260: in function 'destroy'
        [string "bundle:/deps/net.lua"]:307: in function 'destroy'
        [string "bundle:/clipserver.lua"]:135: in function 'stop_server'
        [string "bundle:/clipserver.lua"]:141: in function 'startServer'
        [string "require("gtkclip").startServer("192.168.0.101..."]:1: in main chunk
        [C]: in function 'run'
        [string "bundle:/clipserver.lua"]:180: in function 'fn'
        [string "bundle:deps/require.lua"]:310: in function 'require'
        [string "bundle:/main.lua"]:10: in function 'fn'
        [string "bundle:deps/require.lua"]:310: in function <[string "bundle:deps/require.lua"]:266>

It must be called with a delay

    local old_server = server;
    local timer = uv.new_timer()
    timer:start(3 * 1000, 0, function()
        stop_server(old_server)
        timer:close()
    end)

What I am doing now is switching ports. So I want to shut down the previous server