Why does my SuiteScript fail with a RCRD_DSNT_EXIST error

I have a relatively simple script to delete all the quotes found by a particular search:

function executeSavedSearch(){    var searchresults = nlapiSearchRecord('estimate', 1234, null, null);    for (var i = 0; searchresults != null && i < searchresults.length; i++)    {        try        {            nlapiLogExecution("Debug", "About to delete record id " + id);                        nlapiDeleteRecord(searchresults[i].getRecordType(), searchresults[i].getId());        }        catch (err)        {            var errMessage = err;            if(err instanceof nlobjError)            {                errMessage = errMessage + ' ' + err.getDetails() + ' ' + 'Failed to Delete ID : ' + id;            }            nlapiLogExecution('ERROR', 'Error', errMessage);            return err        }    }}

The problem is that it always fails with a RCRD_DSNT_EXIST error. I put in some debugging, and the ID of the record it first tries to delete is actually valid; more, it does actually delete it. But it throws an error anyway.