Issue with nuke kill script when the nuke explodes. Any solutions?

h = Instance.new("Hint", game.ReplicatedStorage)
script.Parent.Script.Disabled = true
script.Parent.Parent.Alert:Play()
wait(3)
script.Parent.Parent.Evac:Play()
h.Text = "Self-Destruct been has activated."
wait(1)
h.Text = "You Have 30 Seconds!"
script.Parent.Parent.Alarm:Play()
script.Parent.Parent.Snapped:Play()
wait(1)
h.Text = "Self-Destruct 30"
wait(1)
h.Text = "Self-Destruct 29"
wait(1)
h.Text = "Self-Destruct 28"
wait(1)
h.Text = "Self-Destruct 27"
wait(1)
h.Text = "Self-Destruct 26"
wait(1)
h.Text = "Self-Destruct 25"
wait(1)
h.Text = "Self-Destruct 24"
wait(1)
h.Text = "Self-Destruct 23"
wait(1)
h.Text = "Self-Destruct 22"
wait(1)
h.Text = "Self-Destruct 21"
wait(1)
h.Text = "Self-Destruct 20"
wait(1)
h.Text = "Self-Destruct 19"
wait(1)
h.Text = "Self-Destruct 18"
wait(1)
h.Text = "Self-Destruct 17"
wait(1)
h.Text = "Self-Destruct 16"
wait(1)
h.Text = "Self-Destruct 15"
wait(1)
h.Text = "Self-Destruct 14"
wait(1)
h.Text = "Self-Destruct 13"
wait(1)
h.Text = "Self-Destruct 12"
wait(1)
h.Text = "Self-Destruct 11"
wait(1)
h.Text = "Self-Destruct 10"
wait(1)
h.Text = "Self-Destruct 9"
wait(1)
h.Text = "Self-Destruct 8"
wait(1)
h.Text = "Self-Destruct 7"
wait(1)
h.Text = "Self-Destruct 6"
wait(1)
h.Text = "Self-Destruct 5"
wait(1)
h.Text = "Self-Destruct 4"
wait(1)
h.Text = "Self-Destruct 3"
wait(1)
h.Text = "Self-Destruct 2"
wait(1)
h.Text = "Self-Destruct 1"
wait(1)
h.Text = "Self-Destruct 0"
wait(1)
h.Text = "Self-Destruct!!! Find safe zone (its dont help you ;)"
wait(25)
h:Remove()
wait(15)
script.Parent.Parent.Countdown:Play()
script.Parent.Parent.Snapped:Stop()
script.Parent.Parent.Alarm:Stop()
script.Parent.Parent.Music:Play()
wait(12)
script.Parent.Parent.ExplosionSound:Play()
script.Parent.Parent.SBSun.Blast.Disabled = false
script.Parent.Parent.SBSun.part.script = false

script is not a valid member of Part "Workspace.Nuke.SBSun.part" - Server - Script:86 is the error, even though SBsun has a part with a script inside