Help on odd lua error

[YourStalker]

So this guy from ukraine is getting a error:
[ERROR] ...art_welding/lua/weapons/gmod_tool/stools/smartwelder.lua:273: attempt to index local 'ent1' (a nil value)
1. unknown - ...art_welding/lua/weapons/gmod_tool/stools/smartwelder.lua:273
error

It keep telling him its can be because he has over 100 addons on his server but he refuses to listen. That entire section of code is:

function TOOL:WeldEnts(ent1, ent2, bone1, bone2, weldstrength, smartnocollide, weldcount)

         if(ent1:IsValid() and ent2:IsValid()) then                                                           -- this is line 273
	         local const = constraint.Weld( ent1, ent2, bone1, bone2, weldstrength, smartnocollide )
			 undo.AddEntity( const )

			 if(((weldcount+1)%NOTIFYGAP)==0) then

			 		self:GetOwner():PrintMessage(HUD_PRINTCENTER,"Weld "..(weldcount+1).." placed")

			 end
		 end

end

The addon is smart weld. Could this error be because I screwed up fixing the addon for gmod 13. This is my first time scripting in lua so I'm not the greatest. So please help. Thanks

[Leystryku]

[QUOTE=YourStalker;38945059]So this guy from ukraine is getting a error:
[ERROR] ...art_welding/lua/weapons/gmod_tool/stools/smartwelder.lua:273: attempt to index local 'ent1' (a nil value)
1. unknown - ...art_welding/lua/weapons/gmod_tool/stools/smartwelder.lua:273
error

It keep telling him its can be because he has over 100 addons on his server but he refuses to listen. That entire section of code is:

function TOOL:WeldEnts(ent1, ent2, bone1, bone2, weldstrength, smartnocollide, weldcount)

         if(ent1:IsValid() and ent2:IsValid()) then                                                           -- this is line 273
	         local const = constraint.Weld( ent1, ent2, bone1, bone2, weldstrength, smartnocollide )
			 undo.AddEntity( const )

			 if(((weldcount+1)%NOTIFYGAP)==0) then

			 		self:GetOwner():PrintMessage(HUD_PRINTCENTER,"Weld "..(weldcount+1).." placed")

			 end
		 end

end

The addon is smart weld. Could this error be because I screwed up fixing the addon for gmod 13. This is my first time scripting in lua so I'm not the greatest. So please help. Thanks[/QUOTE]

You're calling the function without ent1 or ent2.
Add a check like

if ( ent1 and ent2 and IsValid(ent1) and IsValid(ent2) ) then

That will prevent the error.

[YourStalker]

[QUOTE=Leystryku;38945170]You're calling the function without ent1 or ent2.
Add a check like

if ( ent1 and ent2 and IsValid(ent1) and IsValid(ent2) ) then

That will prevent the error.[/QUOTE]

Why is that though. Was it just because it change from gmod 12 to 13. Oh and thank you very much I really appreciate it ill try it out

[editline]23rd December 2012[/editline]

That made it worse. Now the tool doesn't show