Weld Not Welding But Deleting

[KKlouzal]

Hello, I'm trying to weld a prop to another entity upon collision.

I've checked to make sure the constraint is in fact being created.
Setting deleteent1onbreak to true will delete the prop, but the weld doesn't actually attach the two together..
[url]http://wiki.garrysmod.com/page/constraint/Weld[/url]
What's going on here?

function ENT:Initialize()
	self:SetModel( "models/dx/terminals/dx_terminal_upgrades.mdl" ) 
	self:PhysicsInit( SOLID_VPHYSICS )
	self:SetMoveType( MOVETYPE_VPHYSICS )
	self:SetSolid( SOLID_VPHYSICS )
	
	self.MaxHealth = 10000
	self:SetHealth( self.MaxHealth )
	
	self.AttachWeld = nil
	self.AttachedEnt = nil
	
	local Plug = ents.Create( "prop_physics" )
	Plug:SetModel( "models/props_lab/tpplug.mdl" )
	Plug:SetPos( self:GetPos()+Vector(-30,0,55) )
	Plug:SetAngles( Angle(0,0,180) )
	Plug:Spawn()
	Plug:Activate()
	Plug:SetTrigger( true )
	Plug:AddCallback( "PhysicsCollide", function( PlugEnt, colData )
		if ( colData.DeltaTime > 0.1 ) then
			for _,v in pairs( ents.FindInSphere( PlugEnt:GetPos(), 15 ) ) do
				if ( not IsValid( self.AttachedEnt ) and v.DX_Upgrades ) then
					print(v:GetClass())
					self.AttachedEnt = v
					self.AttachWeld = constraint.Weld( v, PlugEnt, 0, 0, 0, true, true )
					print(self.AttachWeld)
				end
			end
		end
	end )
	
	self.Elastic, self.Rope = constraint.Elastic( Plug, self, 0, 0, Vector(10,0,0), Vector(16,0,55), 2000, 3, 0.01, "cable/cable2", 3, 0 )
	self.Plug = Plug
	self:GetPhysicsObject():EnableMotion( false )
end

[Donkie]

You can't do constraints in the physicscollide callback. A vphysics error will appear and since garry implemented so physics errors remove the entities instead of crashing the game, they dissapear.

To get around this, wrap it around a timer.Simple(0,function()end)

[KKlouzal]

Thank you my good sir! King for you!