I am trying to set create a new clone button only cloning certain fields on the opportunity:

I am recieving a de-reference a null object error.

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



Class.OpportunityCloneWithItemsController: line 32, column 81 External entry point 

Here is the apex class.

public with sharing class OpportunityCloneWithItemsController {
    public OpportunityCloneWithItemsController(ApexPages.StandardController controller) {

    }



        // load the current record
      //  Opportunity o = (Opportunity)controller.getRecord();
 
    
 
    // method called from the VF's action attribute to clone the Opportunity
    public PageReference clone;{
 
         // setup the save point for rollback
         Savepoint sp = Database.setSavepoint();
         Opportunity o;
         Opportunity newO;
 

              //copy the Opportunity - ONLY INCLUDE THE FIELDS YOU WANT TO CLONE
             o = [select  id, Name, Estimated_Cost__c, Margin__c, Competitor_Primary__c, 
             Competitor_Secondary__c, Account_Shipping_Location__c, Amount, INCO_Terms__c,
             Related_Location__c, Language_to_prepare_docs_in__c, Campaignid, Equipment__c,
             Parent__c, Equip_Services_Options_to_be_quoted__c, Lead_Time_Ex_Works__c, Op_Market_Position__c,
             Product_1__c, Product1_condition__c, Product1_Line_Capacity__c, Product1_Bulk_density__c,
             Product1_defect_description__c, Product_2__c, Product_2_Condition__c, Product_2_Line_Capacity__c,
             Product_2_Bulk_Density__c, Product_2_Defect_Description__c, Description, PS__c, Upgrade__c, Farmco__c,
             Service_Contract__c, Potato__c, Processed_Fruit_Veg__c, AIS__c, Project_System_Eng__c, Freshline__c,
             Spare_Parts__c, 
             Pharma__c, Misc_Other__c, AccountId from Opportunity o Where id = :o.id ];
             newO = o.clone(false);
             insert newO;
 

 
             // copy over the line items - ONLY INCLUDE THE FIELDS YOU WANT TO CLONReturn must be called from a method or trigger bodyE
             List<OpportunityLineItem> items = new List<OpportunityLineItem>();
             for (OpportunityLineItem oli : [Select Id, ListPrice, Cost_Each__c, Quantity From OpportunityLineItem ol where OpportunityLineItem.id = :o.id]) {
                  OpportunityLineItem newoli = oli.clone(false);
                //  newO.id = newO.id;
                  items.add(newOli);
             }
             insert items;


   //     return new PageReference('/'+newO.id+'/e?retURL=%2F'+newO.id);

    }

}

How do I solve this problem?

Thank you