My explosion damage script doesn't deal damage to humanoids?

The explosion doesn't deal damge, how do I fix it? Explosion, Bullet and Damage do have a value so it isn't the problem.

local CheckedForKill = false
        Explosion.Hit:connect(function(PartHit, hitDistance)
            if CheckedForKill == false then
                CheckedForKill = true
                local humanoid = PartHit.Parent:FindFirstChild("Humanoid")
                if humanoid and not PartHit.Name == "Bullet" then
                    if hitDistance <= ExplosionRange then
                        humanoid:TakeDamage(Damage)
                        wait(0.05)
                        if humanoid.Health == 0 or humanoid.Health <= 0 then
                            local player = game.Players:GetPlayerFromCharacter(user)
                            player.leaderstats.Kills.Value = player.leaderstats.Kills.Value + 1
                        end
                    end
                end
            end
        end)

And here's an example of what happens: https://gyazo.com/8ef8a1f0297641994130a298049330af