Getting an error even though script apparently works?

[cleversheep]

I'm making a SWEP, and it includes the following code:

[lua]
function SWEP:Think()

if( self.PowerBeamJustFired == true ) then //This variable is determined elsewhere, and is called after firing
self.PowerChargeEndTime = CurTime() + 1
self.PowerBeamJustFired = false
self.ChargeStarted = true
Msg( "JustFired \n" .. CurTime() .. "\n" .. self.PowerChargeEndTime .. "\n" )
end

if( self.Owner:KeyReleased( IN_ATTACK ) && CurTime() > self.PowerChargeEndTime && self.ChargeStarted == true ) then //Line 73
Msg( "Fire \n" .. CurTime() .. "\n" .. self.PowerChargeEndTime .. "\n" )
self.ChargeStarted = false
end

end
[/lua]

However, when I run the code (by firing the weapon, and holding down 1 sec before releasing) I get this in the console:

[lua]
JustFired
4.9649996757507
5.9649996757507
weapons\weapon_armcannon\shared.lua:73: attempt to compare nil with number
Fire
6.6149997711182
5.9649996757507
[/lua]

Line 73 is marked.

Any suggestions on what is causing the error?

Many Thanks

[Crazy Quebec]

Is the error yellow? My guess is that you are running this code in shared but some of the variables used are only defined on the server.

[cleversheep]

Thanks - works fine now