Hi All,
I have created the below code for a trigger that once an opportuntiylineitem is added, edited, deleted or undelted it SUM() the total of all product ids on opportuntilineitems as a particular status.

However I get the below error when you try to update an opportunitylineitem in Salesforce:
LookupRollup: execution of AfterUpdate caused by: System.ListException: Row with null Id at index: 0 Trigger.LookupRollup: line 11, column 1

This is my code for the trigger:

trigger LookupRollup on OpportunityLineItem (after insert,after update, after delete,after undelete) {

     //Declare Variables
    List<Product2> ProductIDs = new List<Product2>();

	//Get list of all product codes on unprocessed orders
    ProductIDs = [ SELECT id,Other_Details__c
							FROM Product2 ];

	//map productid to totals on orders
	MAP<id,AggregateResult > ProductTotal = new MAP<id,AggregateResult >(
        	[SELECT Product2Id,SUM(NUMBER_OF_UNITS__c)vol
			FROM OpportunityLineItem 
			WHERE (Opportunity.Sage_Status__c like 'Processing%' 
			OR Opportunity.Sage_Status__c like 'Despatched%')
             GROUP BY Product2Id]) ;
    
	//Update to product
	FOR (Product2 pt : ProductIds) {
        STRING OnOrderTotal = string.ValueOf(ProductTotal.get(pt.id));
		pt.Other_details__C = OnOrderTotal;
		UPSERT pt;
	}

	}

Any ideas?

Hi All,
I have passed all the challenges of "Lightning Experience Reports & Dashboards Specialist" and received all the points of aech step. But I could not get the superbadge, even I refreshed my page several times.
Can someone please help me on this?

Thanks,
Helen

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