Why Is Part Of My Script Not Working?

I have a Custom Chat GUI but the banned words do not work and I have no idea why below is be script and everything else works fine but the part that stops players saying banned words does not work, why is this?

MAIN SCRIPT:

ChatColors = {"Bright blue","Bright red","Bright green","Bright yellow","Bright orange","Bright violet","White","Black","Pink","Brown"}
BannedWords = {"RUDEWORD"} -- Words players cannot use in the chat.
CustomColor = 159775970 -- The ID of the item needed to change their own custom chat color.
OPrefix = "[OWNER]" -- Prefix used before an owner's name then message.
Owners = {"OWNER","OWNER","OWNER"} -- Players who have the owner prefix.
APrefix = "[ADMIN]" -- Prefix used before an admin's name then message.
Admins = {"ADMIN","ADMIN","ADMIN"} -- Players who have the admin prefix.

game.Players.PlayerAdded:connect(function(player)
    local SV = Instance.new("StringValue")
    SV.Name = "SetColor"
    SV.Value = ChatColors[math.random(1,#ChatColors)]
    player.Chatted:connect(function(message)
        if string.sub(message:lower(),1,3) == "/c "  then
            if game:GetService("MarketplaceService"):PlayerOwnsAsset(player,CustomColor) then
                SV.Value = string.sub(message,4)
            end
        end
        for i,a in pairs(game.Players:GetChildren()) do
            b = a:FindFirstChild("PlayerGui"):FindFirstChild("CustomChat")
            for i,c in pairs(b.ChatBox:GetChildren()) do
                if c:IsA("TextLabel") then
                    c.Position = c.Position - UDim2.new(0,0,0.2,0)
                    if c.AbsolutePosition.Y <= 0 then
                        c:Destroy()
                    end
                end
            end
            local d = game.ReplicatedStorage.Chat:Clone()
            d.Parent = b.ChatBox
            for i,v in pairs(BannedWords) do
                if message:lower():find(v) then
                    d.Text = ""..player.Name.." tried to say a banned word!" break
                end
            end
            if d.Text ~= ""..player.Name.." tried to say a banned word!" then
                for i,x in pairs(Owners) do
                    if player.Name:lower():find(x:lower()) then
                        d.Text = ""..OPrefix.." "..player.Name..": "..message
                    else
                        for i,y in pairs(Admins) do
                            if player.Name:lower():find(y:lower()) then
                                d.Text = ""..APrefix.." "..player.Name..": "..message
                            end
                        end
                    end
                end
                if d.Text ~= ""..OPrefix.." "..player.Name..": "..message and d.Text ~= ""..APrefix.." "..player.Name..": "..message then
                    d.Text = ""..player.Name..": "..message
                end
            end
            d.TextColor3 = BrickColor.new(SV.Value).Color
            game.Debris:AddItem(d,30)
        end
    end)
end)

BROKEN PART:

for i,v in pairs(BannedWords) do
    if message:lower():find(v) then
        d.Text = ""..player.Name.." tried to say a banned word!" break
    end
end