Can someone please tell me why this script crashes my game when i solo test and where?

this script always crashes my game when i solo test but i dont know why and where it crashes

this is the script that crashes the game

local plrs = {game.Workspace.Model}
local parts = {game.Workspace.TestTableThing}
local Region = Region3.new(script.Parent.Parent.PrimaryObject.Position - Vector3.new(160,160,160), script.Parent.Parent.PrimaryObject.Position + Vector3.new(160,160,160))
local pArTsSs = Instance.new("Part", game.Workspace)
pArTsSs.Name = "RegionPart"
pArTsSs.CFrame = Region.CFrame
pArTsSs.Anchored = true
pArTsSs.CanCollide = false
pArTsSs.Transparency = 1




function PresentInTable(player)
	local IsIn = false
	for i, v in pairs(plrs) do
		if v == player then
			IsIn = true
		end
	end
	return IsIn
end

function PartInTable(part)
	local IsInside = false
	for i, v in pairs(parts) do
		if v == part then
			IsInside = true
		end
	end
	return IsInside
end






local parts = game.Workspace:FindPartsInRegion3(Region, pArTsSs, 1000)

for i, v in pairs(parts) do
	if v.Parent:FindFirstChild("Humanoid") and v.Parent:FindFirstChild("HumanoidRootPart") then
		if v.Parent:IsA("Model") then
			local Value = PresentInTable(v.Parent)
			if Value == false then
				local Name = script.Parent.Parent:FindFirstChildOfClass("BoolValue")
				if v.Parent.Name ~= Name.Name then
					table.insert(plrs, v.Parent)
					local PartToLook = Instance.new("Part", v.Parent)
					PartToLook.Transparency = 1
					PartToLook.CanCollide = false
					PartToLook.CFrame = CFrame.new(v.Parent.HumanoidRootPart.Position, script.Parent.Parent.PrimaryObject.CFrame.Position)
					local Weld = Instance.new("WeldConstraint", PartToLook)
					Weld.Part0 = PartToLook
					Weld.Part1 = v.Parent.HumanoidRootPart
					local Attachment = Instance.new("Attachment", PartToLook)
					local Constraint = Instance.new("RodConstraint", PartToLook)
					Constraint.Length = (v.Parent.HumanoidRootPart.Position - script.Parent.Parent.PrimaryObject.Position).magnitude
					Constraint.Attachment0 = PartToLook.Attachment
					Constraint.Attachment1 = script.Parent.Parent.PrimaryObject.Attachment
					local BT = Instance.new("BodyThrust", PartToLook)
					BT.Force = Vector3.new(-90000,0,0)
					local ClonedScript = script.ScriptForHuman:Clone()
					ClonedScript.Parent = PartToLook
					ClonedScript.Name = v.Parent.Name
					ClonedScript.Disabled = false
				end
			end
		end
	else
		if v.Anchored == false then
			local Value = PartInTable(v)
			if Value == false then
				v:BreakJoints()  -- the crashing only happens from here onwards
				table.insert(parts, v)
				local PartToLook = Instance.new("Part", v)
				PartToLook.Transparency = 1
				PartToLook.CanCollide = true
				PartToLook.CFrame = CFrame.new(v.Position, script.Parent.Parent.PrimaryObject.CFrame.Position)
				local Weld = Instance.new("WeldConstraint", PartToLook)
				Weld.Part0 = PartToLook
				Weld.Part1 = script.Parent.Parent.PrimaryObject
				local Attachment = Instance.new("Attachment", PartToLook)
				local Constraint = Instance.new("RodConstraint")
				Constraint.Length = (PartToLook.Position - script.Parent.Parent.PrimaryObject.Position).magnitude
				Constraint.Attachment0 = Attachment
				Constraint.Attachment1 = script.Parent.Parent.PrimaryObject.Attachment
				local BT = Instance.new("BodyThrust", PartToLook)
				BT.Force = Vector3.new(-70000,0,0)
				local ClonedScript = script.ScriptForPart:Clone()
				ClonedScript.Parent = PartToLook
				ClonedScript.Disabled = false
				table.insert(parts, PartToLook)
			end
		end
	end
end

the crashing only occurs after the else statement in the for loop for the table of parts in the region. Thank you.

and btw sry for the messy code

I sincerely apologise for the lack of clarity. This is supposed to be a move for a character. When the move is starting, a clone of a tornado model is parented to the workspace with this script inside a part inside the model. The script's disabled property is then set to false. Ive tested it for some time and realised that the game crashes because of the line of code 'table.insert(parts, v)'. No errors are shown in the output as studio crashes. I have another script similar to this one and it lags a lot less and doesnt crash. The only difference is that it does not add a constraint and attachment to the 'PartToLook'.