Int List won't let me add an Int Variable

Quick summary:

I am randomizing a variety of variables, and then storing the ID of these values in an Int List in the script as they are generated. It generates 10 in a row, and checks against the Int List to see if the ID has been taken already. If the Int List contains the ID already, then a new ID is generated, checks against the Int List, and continues. When the ID is not found inside the Int List it .Add()'s to the Int List and continues generating other information.

I am having a problem with the .Add(). For some really confusing reason, every .Add() I call works perfectly except when the Int has been randomized more than once. If this is confusing, here is my code:

 //KEEP A LOG OF ALL DATABASE ENTRIES USED, TO NOT ALLOW DUPLICATES
 private var nameLog: List.<int> = new List.<int>();
 
 //TESTING VALUES
 private var tripleRandom: int = -1;
 
 function Start() {
     for (var i=0;i<10;i++) {
         generateInfo(); //GENERATE 10
     };
 }
 
 function reRandomizeFeature(totalAmount:int) {
     var rerandomize: int = Random.Range(0, totalAmount); //RANDOMIZE A NEW NUMBER
     Debug.Log('RANDOMIZED A '+rerandomize);
     if (nameLog.Contains(rerandomize)) { //IF THE LIST CONTAINS IT, RE-RANDOMIZE IT AGAIN
         Debug.Log('Contains '+rerandomize+'. Rerandomize it again!');
         reRandomizeFeature(totalAmount);
     } else { //IF IT DOESN'T, ALLOW IT THROUGH
         Debug.Log('Randomized '+rerandomize+' and nameLog does not contain it. Allow it to go through!');
         tripleRandom = rerandomize;
     }
 }
 
 function generateInfo() {
     var char_nameDBLength: int = 15; //15 TOTAL
     var nameSelectedByRandom: int = Random.Range(0, char_nameDBLength); //GENERATE THE FIRST ATTEMPT
 
     Debug.Log('------------------------------');
     if (nameLog.Contains(nameSelectedByRandom)) { //IF LIST CONTAINS THE RANDOMED ID
         Debug.Log('Contains '+nameSelectedByRandom+'. Randomizing a new ID.');
         reRandomizeFeature(char_nameDBLength); //RANDOMIZE A NEW ID
     } else {
         Debug.Log('Does not contain '+nameSelectedByRandom+'. No need to randomize');
     }
 
     Debug.Log('Saving ID '+nameSelectedByRandom+' ('+tripleRandom+') to the NameLog.');
 
     if (tripleRandom <= -1) { //IF THE ID DID NOT HAVE TO BE RANDOMIZED AGAIN
         nameLog.Add(nameSelectedByRandom); //ADD TO THE LIST
         Debug.Log('Do not add Triple Random, add: '+nameSelectedByRandom);
     } else { //IF THE ID HAD TO BE RANDOMIZED (AND THE TEMP VAR IS ABOVE -1), ADD IT TO THE LIST
         Debug.Log('Add Triple random: '+tripleRandom);
             //THIS IS WHERE I GET THE PROBLEMS:
         nameLog.Add(tripleRandom); // IF THIS LINE IS HERE, UNITY COMPLETELY FREEZES AND I HAVE TO CLOSE AND REOPEN.
             //IF THIS LINE IS COMMENTED OUT, THE CODE WORKS BUT NOTHING IS ADDED TO THE INT LIST.
     }

     Debug.Log(nameLog[nameLog.Count-1]); //PRINT THIS ID

     tripleRandom = -1; //RESET THE TEMP ID BACK TO -1 TO BE RESET
     }

The commented line is where the problem arises. I have been fighting to try and figure this out for hours now, and I am just hung up on this tiny little line of code. The annoying thing is if I comment out the nameLog.Add(tripleRandom), and add in "nameLog.Add(5)" or anything like that, the code works perfectly fine. It seems it's the damn variable that is the problem, but I don't understand what's wrong.

Any help would be amazing, thank you.