Why is it that my "e" key isn't working when I pressed it?

My "e" key works before I added this in

local Player = game.Players.LocalPlayer
local char = Player.CharacterAdded:Wait(20)

Now ever since I added that code in to change the Player's Walkspeed (without changing their whole entire speed reseting like speed buffs) my "e" key doesn't work. Why is that happening? There was no error.

Mouse.KeyDown:connect(function(Key)
	if not Equipped then return end
	if string.lower(Key) == "e" then
		if ChargeReady then
			ChargeReady = false
			EE:Play()
			SG:SetCoreGuiEnabled("Backpack", false)
			char.Humanoid.WalkSpeed = char.Humanoid.WalkSpeed - 25
			char.Humanoid.JumpPower = char.Humanoid.JumpPower - 20
			wait(.533)
			Tool.Handle.GroundHit:Play()
			wait(.468)
-- it continues