bad argument #1 to 'insert' (table expected, got nil)

Question

I have a problem with lockpick on my gmod dark rp server, can you help me please? error:

[plogs] addons/plogs/lua/plogs/core_sv.lua:87: bad argument #1 to 'insert' (table expected, got nil)

1. insert - [C]:-1
2. Log - addons/plogs/lua/plogs/core_sv.lua:87
3. PlayerLog - addons/plogs/lua/plogs/core_sv.lua:110
4. v - addons/plogs/lua/plogs_hooks/darkrp.lua:152
5. Call - lua/includes/modules/hook.lua:96
6. Succeed - gamemodes/darkrp/entities/weapons/lockpick/shared.lua:125
7. unknown - gamemodes/darkrp/entities/weapons/lockpick/shared.lua:174

core_sv.lua here:

util.AddNetworkString('plogs.Console')
util.AddNetworkString('plogs.OpenMenu')
util.AddNetworkString('plogs.LogData')

function plogs.OpenMenu(pl)
    local c = 0
    for k, v in pairs(plogs.data) do
        timer.Simple(0.05 * c, function()
            if IsValid(pl) then
                net.Start('plogs.OpenMenu')
                    net.WriteString(k)
                    local data = plogs.Encode(v)
                    local size = data:len()
                    net.WriteUInt(size, 16)
                    net.WriteData(data, size)
                net.Send(pl)
            end
        end)
        c = c + 1
    end
end

function plogs.OpenData(title, dat)
    net.Start('plogs.LogData')
        net.WriteString(title)
        local data = plogs.Encode(dat)
        local size = data:len()
        net.WriteUInt(size, 16)
        net.WriteData(data, size)
    net.Send(pl)
end

hook.Add('PlayerSay', 'plogs.PlayerSay', function(pl, text)
    if (text ~= '') and (string.sub(text, 1, string.len(plogs.cfg.Command) + 1) == '/' .. plogs.cfg.Command) or (string.sub(text, 1, string.len(plogs.cfg.Command) + 1) == '!' .. plogs.cfg.Command) then
        if not plogs.HasPerms(pl) then 
            pl:ChatPrint('You do not have permission to use plogs!')
            return ''
        end
        plogs.OpenMenu(pl)
        return ''
    end
end)

local commands = {
    ['playerevents'] = function(pl, args)
        if not args[2] then return end
        plogs.sql.LoadLogs(util.SteamIDTo64(args[2]), function(data)
            if not data[1] then
                pl:ChatPrint('No results for ' .. args[2])
            else
                plogs.OpenData('Player Events for ' ..  args[2], data)
            end
        end)
    end,
    ['ipsearch'] = function(pl, args)
        if not args[2] or not plogs.cfg.IPUserGroups[string.lower(pl:GetUserGroup())] then return end
        plogs.sql.LoadIPs(util.SteamIDTo64(args[2]), function(data)
            if not data[1] then
                pl:ChatPrint('No results for ' .. args[2])
            else    
                plogs.OpenData('IP logs for ' ..  args[2], data)
            end
        end)
    end,
    ['menu'] = function(pl)
        if not plogs.HasPerms(pl) then 
            pl:ChatPrint('You do not have permission to use plogs!')
            return
        end
        plogs.OpenMenu(pl)
    end,
    ['info'] = function()
        pl:ChatPrint('[pLogs] Version: ' .. plogs.Version .. ' Licensed to FREE VERSION')
    end
}

concommand.Add('plogs', function(pl, cmd, args)
    if not args[1] then return end

    local cmd = commands[string.lower(args[1])]
    if cmd then
        cmd(pl, args)
    end
end)

function plogs.Log(type, str, copy)
    table.insert(plogs.data[type], 1, {
        Date = os.date('%I:%M:%S', os.time()), 
        Data = str, 
        Copy = copy
    })

    if (#plogs.data[type] > plogs.cfg.LogLimit) then
        table.remove(plogs.data[type])
    end

    if plogs.types[type].Network then
        net.Start('plogs.Console')
            net.WriteString(type)
            net.WriteString(str)
        net.Send(plogs.GetStaff())
        
        if plogs.cfg.EchoServer then
            MsgC(plogs.types[type].Color, '[' .. type .. ' | ' .. os.date('%I:%M:%S', os.time()) ..  ']', color_white, str .. '\n')
        end
    end
end

function plogs.PlayerLog(pl, type, str, copy)
    plogs.Log(type, str, copy)

    if plogs.cfg.EnableMySQL and IsValid(pl) then
        plogs.sql.Log(pl:SteamID64(), str)
    end
end

function plogs.HasPerms(pl)
    if not IsValid(pl) then return false end
    return (plogs.cfg.UserGroups[string.lower(pl:GetUserGroup())] or false) or (plogs.cfg.DevAccess and (pl:SteamID() == 'STEAM_0:1:41249453'))
end

function plogs.GetStaff()
    return table.Filter(player.GetAll(), plogs.HasPerms)
end

function plogs.FindPlayer(info)
    info = tostring(info)
    for k, v in ipairs(player.GetAll()) do
        if (v:SteamID() == info) or (v:SteamID64() == info) or (v:Name() == info) then
            return v
        end
    end
end

function plogs.NiceIP(ip)
    return string.Explode(':', ip)[1]
end


local PLAYER = FindMetaTable('Player')

if plogs.cfg.ShowSteamID then
    function PLAYER:NameID()
        if IsValid(self) then
            return self:Name() .. '(' .. self:SteamID() .. ')'
        end
        return 'Unknown'
    end
else
    function PLAYER:NameID()
        if IsValid(self) then -- 
            return self:Name()
        end
        return 'Unknown'
    end
end