Server script crashing when checking for items

Help and Feedback Scripting Support
5 
--//Services
local Players = game:GetService("Players")
local RunService = game:GetService("RunService")

--//Loops
while true do
	for i, Player in ipairs(Players:GetPlayers()) do
		if Player.Character and not Player.Character:FindFirstChild("Sword") then
			hideSwordEffects(v)
		end
	end

	RunService.Heartbeat:Wait()
end