My Q script isnt working very well once it reaches a specific point? Solved

local player = game.Players.LocalPlayer
local Mouse = player:GetMouse()

Mouse.KeyDown:connect(function(key)
    key = key:lower() 
    if (key == "q") then 
            if Mouse.Target:FindFirstChild("SBF") then
		
			if player.PlayerGui:FindFirstChild("InventoryGui").Frame.one.Emp.Value == "0" then --EDIT: I PUT "" For the 0
						
		player.PlayerGui:FindFirstChild("Nam").Value = Mouse.Target:FindFirstChild("ITN").Value
						
					
					
					
					
					
end
end
end
end)

I'm having trouble on the line after "if Mouse.Target:FindFirstChild("SBF") then" It's not working after that. I tested with a print and nothing pops up. am I naming things worng? Please do help if any questions please do let me know.