Why does my teleport script make the player crash?

I'm making a part that will teleport a player to a game within my place's Universe. When a person touches the part, instead of teleporting, their game freezes, and they are forced to close ROBLOX. Here's the teleport script, which is inside a part in the Workspace:

Allowed_Players = {"Minifig77", "bramblepath2"} --Whitelist

db = false
script.Parent.Touched:connect(function(part)
    if db == false then
        db = true
        local plr = game.Players:GetPlayerFromCharacter(part.Parent)
        if plr then
            for i,v in pairs(Allowed_Players) do --Iterate over whitelist
                if v == plr.Name then --Check for permission
                    game:GetService("TeleportService"):Teleport(431505384, plr) --Teleport
                    wait(2)
                    db = false
                    return
                end
            end
        else
            wait(1)
            db = false
        end
    end
end)

The same thing happens in a portal I scripted:

Whitelist = {16754553, 8184187, 26275462} --User IDs of allowed players
db2 = false
mode = 1
--The code below was cut out of a larger function.
con = script.Parent.Touched:connect(function(part)
    local plr = game:GetService("Players"):GetPlayerFromCharacter(part.Parent)
    if plr and db2 == false then
        --Teleport
        db2 = true
        if mode == 1 then --Mode 1 means to teleport to a certain place...
            game:GetService("TeleportService"):Teleport(Places[mode], plr) --Teleport
        elseif mode == 2 then --While mode 2 takes the player to another place.
            for i,v in pairs(Whitelist) do --Iterate over Whitelist
                if plr.UserId == v then --Check for permissions
                game:GetService("TeleportService"):Teleport(Places[mode], plr) --Teleport
            end
        end
        end
        wait(.1)
        db2 = false
    end
end)

However, when I made a simpler version of the script for a place that demonstrated the problem, the teleport worked seamlessly.

This script also worked fine in the same place as my previous two scripts:

game.Players.PlayerAdded:connect(function(plr)
    wait(10)
    game:GetService("TeleportService"):Teleport(431505384, plr)
end)

Why do the first two scripts crash the player, while the third works fine? Is there any way I can make them work?

Thank you for your time.