System.DmlException: Update failed. First exception on row 0 with id 0068E00000EEPmvQAH; first error: CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY, OpportunityTriggers: execution of AfterUpdate

caused by: System.NullPointerException: Attempt to de-reference a null object

Trigger.OpportunityTriggers: line 24, column 1: []

@isTest
private class OpportunityTriggersTest {
    private static String name='Test Account';
    
    /// Nathan Prats 06/22/2018.
    @isTest static void PrimaryPartnerGrossMarginTest() {
        
        // Create accounts & contact & opportunity & opportunity contact role
        Account acct = TestUtils.CreateAccount('Standard'+ name);
        Account pacct = TestUtils.CreatePartnerAccount(' partner'+ name);
        Contact con  = TestUtils.CreateContact('firstName','lastName',acct);
        Opportunity opty = TestUtils.CreateOpportunity(acct, pacct);
        OpportunityContactRole ocr = TestUtils.CreateContactRoleOnOpportunity(con, opty);
        
        // Set partner information
        opty.Primary_Partner_Role__c='Reseller';
        opty.Primary_Partner_Margin__c=20;
        opty.RecordTypeId = Schema.SObjectType.Opportunity.getRecordTypeInfosByName().get('SaaS Enterprise').getRecordTypeId();
        
        // Create a quote and sync it
        Quote qte = TestUtils.CreateQuote(con,opty);
        opty.SyncedQuoteId = qte.Id;
        Database.update(opty);
        
        // Create 2 products, a software product and a non software product
        Product2 pdct1= TestUtils.CreateProduct2('Product1','Software');
        Product2 pdct2= TestUtils.CreateProduct2('Product2','Customer Success');
        
        // Create 2 PriceBookEntries
        PricebookEntry pbe1 = TestUtils.createPricebookEntry(pdct1,100);
        PricebookEntry pbe2 = TestUtils.createPricebookEntry(pdct2,200);
        
        // Add 2 Quote Line Items, a software product and a non software product
        QuoteLineItem qli1 = TestUtils.createQuoteLineItem(pdct1,qte,1,Date.today(),100,pbe1);
        QuoteLineItem qli2 = TestUtils.createQuoteLineItem(pdct2,qte,1,Date.today(),200,pbe2);
        
        // Verify that the Primary_Partner_Gross_Margin__c = sum of software opportunity products * % margin
        // Should be 20 in this case, not 20+40.
        System.assertEquals(20, opty.Primary_Partner_Gross_Margin__c);
        
    }
}