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Hitesh Chaudhari 10Hitesh Chaudhari 10 

mytask13: execution of BeforeUpdatecaused by: System.NullPointerException: Attempt to de-reference a null object()

I am getting follwing error when trying to create a new task and link it to incident.

"mytask13: execution of BeforeUpdatecaused by: System.NullPointerException: Attempt to de-reference a null object()"

I am trying update incident who hasn't assigned any template and attached to task.
Those incident who satisfy above condition I want their task's description to be updated and respected incident's template need to update.   

Following is the code I am using .

trigger mytask13 on BMCServiceDesk__Task__c(after update,before update)
{

        List<BMCServiceDesk__Incident__c> myinc{get;set;}
        
    for(BMCServiceDesk__Task__c myobject :Trigger.new)
    {
      List<BMCServiceDesk__Task__c> mytask = [SELECT id,name,BMCServiceDesk__FKIncident__c FROM BMCServiceDesk__task__c where BMCServiceDesk__FKIncident__c !='' and BMCServiceDesk__FKIncident__r.BMCServiceDesk__FKTemplate__c = ''];
               myobject.BMCServiceDesk__taskDescription__c = 'task description updated through trigger';
               myobject.BMCServiceDesk__FKIncident__r.BMCServiceDesk__FKTemplate__c= 'a3k7F0000004UNvQAM';
               
           
    }
}
Musunuru SurekhaMusunuru Surekha
Hello,

Can you share the complete code?
Hitesh Chaudhari 10Hitesh Chaudhari 10
I already posted it above  : 

trigger mytask13 on BMCServiceDesk__Task__c(after update,before update)
{

       List<BMCServiceDesk__Incident__c> myinc{get;set;}
       for(BMCServiceDesk__Task__c myobject :Trigger.new)
    {
      List<BMCServiceDesk__Task__c> mytask = [SELECT                                                     id,name,BMCServiceDesk__FKIncident__c FROM BMCServiceDesk__task__c where BMCServiceDesk__FKIncident__c !='' and BMCServiceDesk__FKIncident__r.BMCServiceDesk__FKTemplate__c = ''];

               myobject.BMCServiceDesk__taskDescription__c = 'task description updated through trigger';

               myobject.BMCServiceDesk__FKIncident__r.BMCServiceDesk__FKTemplate__c= 'a3k7F0000004UNvQAM';
               
           
    }
}