Smart Campaign fails in the Detail and generate "Failed: None.get"

[crussarollo]

We have created a program that allows you to view and identify the subscription of an account based on a series of tokens that concern the calculation of points;

In the Dev area we used this Token:

#if($listOne)
#set( $intMax = $math.sub($listOne.size(),1) )
#foreach( $num in [ $intMax..0 ] )
#if(${listOne.get($num)} && ${listOne.get($num).listTwo.get(0)} )
${listOne.get($num).listTwo.get(0).name}
#break
#end
#end
#end

And we used the same token in Production Area ;

Dev Area :

Shows this results for the Activity Log of the user :

The results of the Campaign, in this case the emails are sent and delivered :

Moreover we have obtained the same results through the use of a batch campaign activated with a Run Once while in production with the same operation we have not obtained any results. 

Production Area :

once we changed users in production we tested the campaign using the same Token but we found different results, we obtained this results for the Activity Log of the user :

While the results of the campaign are as follows:

Why, since there are no differences between the two environments, we find this error in sending emails: None.get ?

[SanfordWhiteman]

There's not really enough information here because you haven't provided examples of your lists.

Even without that, I can say almost certainly that your code is buggy because you're using Boolean conditions (#if($listOne)) on List objects, which are always truthy regardless of their contents. It's impossible to have a falsy List. (A null is falsy in Velocity, but that's not the same thing, and you should check for null explicitly.)

Also, you don't need to #foreach over indexes in a List to do a reverse scan, you can sort the List and use a standard iterator.

Most likely the direct cause of that None.get is you didn't check off necessary objects in the tree in Script Editor, but you should also fix the code.

[crussarollo]

Thanks a lot for the answer.

We changed the token like this:

#if(($listOne) && ($listOne.size() > 0))
        #set( $intMax = $math.sub($listOne.size(),1) )
           #foreach( $num in [ $intMax..0 ] )
               #if($listOne.get($num) && ${listOne.get($num).listTwo.get(0) )
                   $listOne.get($num).listTwo.get(0).name}
               #break
               #end
       #end
#end

Unfortunately after modifying the token and checking the fields of the tree in the Script Editor; I get the same result:

Thanks in advance for your cooperation