SWEP attacks and can't set the same entity on fire more than once

[sean1]

I've been making some zombie sweps and everything works fine, I wanted to make a zombie swep that ignite any entity that was hit for 5 seconds and it works fine. But the problem is the swep will not set the same entity on fire more than once.

[B]Code with the ignite part in it:[/B]

function SWEP:Think()
    if not self.NextHit or CurTime() < self.NextHit then return end
    self.NextHit = nil

    local pl = self.Owner

    local vStart = pl:EyePos() + Vector(0, 0, -40)
    local trace = util.TraceLine({start=vStart, endpos = vStart + pl:GetAimVector() * 65, filter = pl, mask = MASK_SHOT})

    local ent
    if trace.HitNonWorld then
        ent = trace.Entity
    elseif self.PreHit and self.PreHit:IsValid() and not (self.PreHit:IsPlayer() and not self.PreHit:Alive()) and self.PreHit:GetPos():Distance(vStart) < 110 then
        ent = self.PreHit
        trace.Hit = true
    end

    if trace.Hit then
        pl:EmitSound("npc/zombie/claw_strike"..math.random(1, 3)..".wav")
    end

    pl:EmitSound("npc/zombie/claw_miss"..math.random(1, 2)..".wav")
    self.PreHit = nil

    if ent and ent:IsValid() and not (ent:IsPlayer() and not ent:Alive()) then
            local damage = 25
			local igniteForSeconds = 5		
			ent:Ignite(igniteForSeconds,0)
            local phys = ent:GetPhysicsObject()
            if phys:IsValid() and not ent:IsNPC() and phys:IsMoveable() then
                local vel = damage * 423 * pl:GetAimVector()

                phys:ApplyForceOffset(vel, (ent:NearestPoint(pl:GetShootPos()) + ent:GetPos() * 2) / 3)
                ent:SetPhysicsAttacker(pl)
            end
            if not CLIENT and SERVER then
            ent:TakeDamage(damage, pl, self)
        end
    end
end

[sean1]

Please help, I really need this