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# How do I fix a randomly crashing loop?

Ok, so I have a gun kit that has bullet trails, and the bullet trails sometimes cause the player using the gun to crash.

Here's the loop that creates the bullet trails:

spawn(function()
local LastPos2 = nil
while true do
if LastPos2 then
if (not Bullet:IsDescendantOf(game)) then break end
Bullet.CFrame = CFrame.new(Bullet.CFrame.p, Bullet.CFrame.p + Bullet.Velocity)
local Trail = Instance.new("Part")
Trail.BrickColor = S.TrailColor
Trail.Transparency = S.TrailTransparency
Trail.Anchored = true
Trail.CanCollide = false
Trail.Size = VEC3(1, 1, 1)
local Mesh = Instance.new("BlockMesh")
Mesh.Offset = VEC3(0, 0, -(Bullet.Position - LastPos2).magnitude / 2)
Mesh.Scale = VEC3(S.TrailThickness, S.TrailThickness, (Bullet.Position - LastPos2).magnitude)
Mesh.Parent = Trail
Trail.Parent = Gun_Ignore
Trail.CFrame = CF(LastPos2, Bullet.Position)
delay(S.TrailVisibleTime, function()
if S.TrailDisappearTime > 0 then
local X = 0
while true do
if X == 90 then break end
if (not Selected) then break end
local NewX = X + (1.5 / S.TrailDisappearTime)
X = (NewX > 90 and 90 or NewX)
local Alpha = X / 90
Trail.Transparency = NumLerp(S.TrailTransparency, 1, Alpha)
RS:wait()
end
Trail:Destroy()
else
Trail:Destroy()
end
end)
LastPos2 = Bullet.Position
else
LastPos2 = Main.CFrame.p
end
wait() --There's a wait in this loop
end
end)


And this loop is located in the Firing function, which is called every time the gun is fired.

This is the loop that fires the gun:

while MB1_Down and (not Reloading) do
if Knifing and (not ThrowingGrenade) then break end
if Running then break end
if Ammo.Value > 0 then
Ammo.Value = Ammo.Value - 1
if Humanoid.Health ~= 0 then
end
Fire_Gun() --This is the Firing function which the loop is located in
end
end
if Ammo.Value == 0 and S.AutoReload then
wait(0.2)
end
wait(60 / S.FireRate) --There's a wait in this loop
end


The problem is, sometimes the gun randomly crashes after the gun is fired, and I know it's caused by the trails because when I comment it out, the gun doesn't crash. Any ideas on what the problem might be or on how to fix this problem? Thanks.

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This is caused because you're having an endless loop with no yeild - while true do --code end - You need to puta wait() in those loops. Goulstem 8126 — 5y
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Both loops have wait()'s though TurboFusion 1821 — 5y
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I would say its a stack error from ROBLOX with Fire_Gun() because of the spawn function. MessorAdmin 598 — 5y
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Ok, how would I fix it then? TurboFusion 1821 — 5y