CPQ error 'Attempt to de-reference a null object' on Quote Configuration

To troubleshoot this issue, ensure that the following fields are populated on all Quote Line records:

• Quantity
• List Unit Price OR Special Price

With the necessary permissions to access the Developer Console, you can use the Query Editor tab and paste the SOQL query below to find the required fields for price calculations:

SELECT Id, Name, SBQQ__Quantity__c, SBQQ__ListPrice__c, SBQQ__SpecialPrice__c 
FROM SBQQ__QuoteLine__c WHERE SBQQ__Quote__c = [id]

NOTE: If Quote Lines have related Groups, all Quote Lines must have a Group populated on all Quote Line records.