Apex CronTrigger Throws error while aborting: Job does not exist or is already aborted.

Question

I keep getting this error when I try to abort a scheduled job in my batch job code.

Below is my code:

Datetime dt = system.now().addMinutes(Integer.valueof(myCustomObject.Time_Interval__c));
String day = string.valueOf(dt.day());
String month = string.valueOf(dt.month());
String hour = string.valueOf(dt.hour());
String minute = string.valueOf(dt.minute());
String second = string.valueOf(dt.second());
String year = string.valueOf(dt.year());  
String strJobName = 'TestJob-' + String.valueof(dt);                        
String strSchedule = '0 ' + minute + ' ' + hour + ' ' + day + ' ' + month + ' ?' + ' ' + year;


if(!test.isRunningTest())
{
    System.schedule(strJobName, strSchedule, new VGA_scheduleManualLeadAssignment(objplc.Id));
}
List<CronTrigger> lstCron = [select Id from CronTrigger where NextFireTime = Null AND State = 'DELETED'];                        
 if(lstCron != Null && !lstCron.isEmpty())
 {
                    for(CronTrigger obj : lstCron) 
                    {

                      if(obj.Id != Null)
                      {

                          system.abortjob(obj.Id); 
                          //Errors out sometimes //
                      }
                    }
 }

This error is thrown sometimes ---> Job does not exist or is already aborted.

Answer 1

As per the salesforce documentation :

System.abortJob(jobId) Stops the specified job. The stopped job is still visible in the job queue in the Salesforce user interface.

Here you are trying to abort 'DELETED' jobs. The System.abortJob method takes a jobId as a parameter. If jobId that is no longer valid then you will get above error when attempting to abort it.