Code Not Working - Networking doesn't go as planned

[MaximLaHaxim]

Okay. What I want to do is network a float to the client so they can see the remaining time left before a wave of enemies spawns. This is how it works serverside:

--shitty way to do something like this, but at least it should work

--we need to network our wave timer, we'll do it here

function networktimer( ply )

	net.Start( "NetworkTimer" )
	
	net.WriteFloat( GAMEMODE:GetNextWave() )
	
	net.Send( ply )

end

hook.Add( "PlayerSpawn", "GamemodePlayerSpawn", function( ply )

	if !ply.initialSpawned and !GetGlobalBool( "InWave" ) then
	 
	--this logic is shitting up my head, but I'm trying my best

		networktimer( ply )
		
		print("networked")

		ply.initialSpawned = true
		  
	end

end )

GAMEMODE:GetNextWave() being a convenience func I made to get my nextwave var.

Clientside:

local IndivRndTime = 0

net.Receive( "NetworkTimer", function( len )

	IndivRndTime = net.ReadFloat()
	
	print(IndivRndTime-CurTime())

end )

local svs_hud = {}

function svs_hud:PaintRoundStatusBar( bot )

	if bot then return end --don't draw if we're a bot
	
	if IndivRndTime != 0 then
	
		local str = string.format( "Time: %i", IndivRndTime )
	
	end

	surface.SetDrawColor( 0, 0, 205, 25 ) --background
	surface.DrawRect( ScrW() / 25, ScrH() / 1.3, 0.20 * ScrW(), 91 )

	surface.SetDrawColor( 70, 220, 8, 215 ) --border
	surface.DrawOutlinedRect( ScrW() / 25, ScrH() / 1.3, 0.20 * ScrW(), 91 )
	
	surface.SetFont( "DermaDefaultBold" )
	surface.SetTextColor( 255, 255, 255, 255 )
	surface.SetTextPos( ScrW() / 16, ScrH() / 1.23 )
	surface.DrawText( GetGlobalBool( "InWave" ) and "Status: In Wave" or str --[[or "None"]] )
	
end

function GM:HUDPaint()
	if LocalPlayer():Alive() then
		svs_hud.PaintRoundStatusBar( LocalPlayer():IsBot() )
	end
end

Also, note that !GetGlobalBool( "InWave" ) shows whether we're in the preparation stage or not.

Now, I get the following error with the code:

[ERROR] addons/spysvssoldiers/gamemodes/svs/gamemode/cl_exts.lua:39: bad argument #1 to 'DrawText' (string expected, got nil)
  1. DrawText - [C]:-1
   2. PaintRoundStatusBar - addons/spiesvssoldiers/gamemodes/svs/gamemode/cl_exts.lua:39
    3. unknown - addons/spiesvssoldiers/gamemodes/svs/gamemode/cl_exts.lua:45

What went wrong?