We have a license of audience studio and data studio, and we do not know if we can have several instances within that license, so that each instance is from one of the groups of the business organization. Thank you

I would like to create a trigger to activate when using the Battle class and its battle percentage method, but it gives me a "activate percentage: execution of BeforeInsert caused by: System.NullPointerException: Attempt to de-reference a null object Class.Battle. Battle percentage: line 5, column 1 Trigger. Activate percentage: line 4, column 1 "What could be the solution? thank you
My class:
 

public class Batalla {

public List<Batalla__c> porcentajebatalla(Map<Id, Batalla__c> batallas) {
       //List<Batalla__c> ListBattle = [SELECT Id,Oponente2__c, Poder_ejercito1__c, Puntos_poder_ejercito2__c, Porcentaje_batalla__c FROM Batalla__c];
       List<Batalla__c> ListBattle = batallas.values();
       
    
       Double high = 0.0;
       Double high2 = 0.0;
       Double low = 0.0;
       Double low2 = 0.0;
       Double combatP1 = 0.0;
       Double combatP2 = 0.0;
      // Double resultBattle = 0.0;
       Double result = 0.0;
       Double result2 = 0.0;
       Integer QuerySize = ListBattle.size();
       System.debug('QuerySize = ' + QuerySize);
       if(QuerySize > 0 ) {
          for(Batalla__c battle : ListBattle){
               combatP1 = battle.Poder_ejercito1__c;
               System.debug('combatP1 = ' + combatP1);
               combatP2 = battle.Puntos_poder_ejercito2__c;
               System.debug('combatP2 = ' + combatP2);
               high = combatP1 * 0.4;
                low = combatP1  * 0.2;
               high2 = combatP2 * 0.4;
                low2 = combatP2  * 0.2;
               System.debug('high = ' + combatP1 * 0.4);
                System.debug('low = ' + combatP1  * 0.2);
               System.debug('high2 = ' + combatP2 * 0.4);
                 System.debug('low2 = ' + combatP2  * 0.2);
               result = (math.random() * (high-low) + low);
              result2 = (math.random() * (high2-low2) + low2);
               battle.Porcentaje_batalla__c = result;
              battle.Porcentaje_2__c = result2;
               /*System.debug('battle.Porcentaje_batalla__c = ' + battle.Porcentaje_batalla__c);
                resultBattle = combatP2 - result;
               System.debug('resultBattle = ' + resultBattle);*/
                System.debug('result = ' + result);
              System.debug('result2 = ' + result2);
           }
       }
         upsert ListBattle;
       return ListBattle;
   }  


}

And my trigger is:
 

trigger activarporcentaje on Batalla__c (before insert) {
	
   Batalla bata = new Batalla();
   bata.porcentajebatalla(Trigger.newMap);
    
}

 

I would like to create a trigger to activate when using the Battle class and its battle percentage method, but it gives me a "activate percentage: execution of BeforeInsert caused by: System.NullPointerException: Attempt to de-reference a null object Class.Battle. Battle percentage: line 5, column 1 Trigger. Activate percentage: line 4, column 1 "What could be the solution? thank you
My class:
 

public class Batalla {

public List<Batalla__c> porcentajebatalla(Map<Id, Batalla__c> batallas) {
       //List<Batalla__c> ListBattle = [SELECT Id,Oponente2__c, Poder_ejercito1__c, Puntos_poder_ejercito2__c, Porcentaje_batalla__c FROM Batalla__c];
       List<Batalla__c> ListBattle = batallas.values();
       
    
       Double high = 0.0;
       Double high2 = 0.0;
       Double low = 0.0;
       Double low2 = 0.0;
       Double combatP1 = 0.0;
       Double combatP2 = 0.0;
      // Double resultBattle = 0.0;
       Double result = 0.0;
       Double result2 = 0.0;
       Integer QuerySize = ListBattle.size();
       System.debug('QuerySize = ' + QuerySize);
       if(QuerySize > 0 ) {
          for(Batalla__c battle : ListBattle){
               combatP1 = battle.Poder_ejercito1__c;
               System.debug('combatP1 = ' + combatP1);
               combatP2 = battle.Puntos_poder_ejercito2__c;
               System.debug('combatP2 = ' + combatP2);
               high = combatP1 * 0.4;
                low = combatP1  * 0.2;
               high2 = combatP2 * 0.4;
                low2 = combatP2  * 0.2;
               System.debug('high = ' + combatP1 * 0.4);
                System.debug('low = ' + combatP1  * 0.2);
               System.debug('high2 = ' + combatP2 * 0.4);
                 System.debug('low2 = ' + combatP2  * 0.2);
               result = (math.random() * (high-low) + low);
              result2 = (math.random() * (high2-low2) + low2);
               battle.Porcentaje_batalla__c = result;
              battle.Porcentaje_2__c = result2;
               /*System.debug('battle.Porcentaje_batalla__c = ' + battle.Porcentaje_batalla__c);
                resultBattle = combatP2 - result;
               System.debug('resultBattle = ' + resultBattle);*/
                System.debug('result = ' + result);
              System.debug('result2 = ' + result2);
           }
       }
         upsert ListBattle;
       return ListBattle;
   }  


}

And my trigger is:
 

trigger activarporcentaje on Batalla__c (before insert) {
	
   Batalla bata = new Batalla();
   bata.porcentajebatalla(Trigger.newMap);
    
}