Hello,

I'm using a custom controller on a visualforce page to access a list of records which are unrelated. I get the de-reference null error on the visualforce page when I land on it. I am comparing a multiselect picklist field called protocols__c on the account object with a  string field on an object called AlertManagement__c.  If they equal each other then i want to populate them to the listGrab which my visualforce getter should show on the page. This is being accessed through the customer portal.

I realise that the null error is being thrown because of the  listGrab.add(al);  If I take it out the error isn't thrown.

However i know that the listFlux I am iterating over is not empty.  Is there something I am not declaring or am I going about this in the wrong way? Can someone help or give me some direction?

Thanks!

Here is the visualforce page part which is accessing the controller
        <apex:repeat value="{!listgrab}" var="f">
        <li>            
                    <span style="font-size: 13px;"><b>{!f.Description__c}</b>
                        <br/><apex:outputtext value="{!f.Alert_Message__c}" escape="false"/></span>
         
        </li>
        </apex:repeat>

Here the controller

public class portalHomePageController {
    public List <Contact> oContact {get;set;}
    public List <AlertManagement__c> listGrab {get;set;}
    
    
    public portalHomePageController(){
        
        User u=[select id, ContactId from User where id=:userinfo.getuserid()];
        oContact=[select id, Name, Account.Name,Account.Bank__c,Account.Protocol__c from Contact where id=:u.ContactId];
        List <AlertManagement__c> listFlux=[select id, Description__c,Description_FR__c, Alert_Message__c,Alert_Message_FR__c,        
        Bank__c,Platform__c,Protocol__c from AlertManagement__c where Active__c=true];
                        
           // iterate over the list of contacts which should only be one

           for(Contact oc: oContact){

            // Here i am splitting out the multiselect values into a string
            string[] protocols = oc.Account.Protocol__c.split(';',0);
         
            // Here I am iterating over the list of alerts               

            for(AlertManagement__c al: listFlux){
                                
                    if(protocols != null && protocols.size() >0){
                        //Now iterate over the array of multiselect values from above

                        for(String p: protocols){                                                 
                             // the value of the string from the multiselect == the value of the text string on the aler record

                             if(p == al.Protocol__c){
                                //add the alert record to the listGrab to show on the visualforce page.
                                listGrab.add(al);
                                
                        
                            }
                        }
                    }    
                }
        }
    }
}