Is "interaction" being loaded by SOQL in your controller extension?   It sounds like you are just not reading the referenced fields. 

How would I find this out?

I have taken over doing this from an outside company. We are just trying to make a few changes to the pages.

Any help is greatly appreciated

Can you post the code for the controller extension "CallInteractionExtension"

public class CallInteractionExtension {
public User usr {get;set;}
public Account nonPersonAccount {get;set;}
public Call_crm__c interaction {get;set;}
public List<Selectoption> listOfAddress {get;set;}
public Map<String,Ref_Call_Attendee_crm__c> existingCallAttendee {get;set;}
public transient Map<String,CallTask> existingCallTaskMap{get;set;}
public Map<String,Call_Product_Detail_crm__c> existingCallProduct {get;set;}
public List<String> followuptaks {get;set;}
public List<Selectoption> userTrs {get;set;}
public List<SelectOption> followUpType {get;set;}
public Boolean isSaved {get;set;}
public Price_Quote_Activity_crm__c callPriceActivity {get;set;}
public List<CallTask> existingCallTask{get;set;}
public Boolean isProposalSelected {get;set;}
public Contact contact {get;set;}
public List<Selectoption> timeList {get;set;}
public String timestamp {get;set;}
public String addedCallAttendee {get;set;}
public String deletedCallAttendee {get;set;}

public String CreatedByInfo { get; set; }

//Key=> AccountId
public transient Map<String,CallAttendee> mapCallAttendee {get;set;}
public List<CallAttendee> listcallAttendee {get;set;}
public List<CallAttendee> addedlistcallAttendee {get;set;}

//Product Line Info
public List<ProductLineInfo> productLineInfos {get;set;}

public CallInteractionExtension(Apexpages.Standardcontroller stdCon){
usr = [Select u.TimeZoneSidKey From User u Where id=:UserInfo.getUserId() limit 1];
existingCallTask = new List<CallTask>();
addedCallAttendee = deletedCallAttendee = '';
listcallAttendee = new List<CallAttendee>();
mapCallAttendee = new Map<String,CallAttendee>();
addedlistcallAttendee = new List<CallAttendee>();

getTimeStamp();
contact = new Contact();
existingCallTaskMap = new Map<String,CallTask>();
isProposalSelected = false;
isSaved = false;
callPriceActivity = new Price_Quote_Activity_crm__c();
followuptaks = new List<String>();
existingCallAttendee = new Map<String,Ref_Call_Attendee_crm__c>();
existingCallProduct = new Map<String,Call_Product_Detail_crm__c>();
if(Apexpages.currentPage().getParameters().get('accountId') != null
&& Apexpages.currentPage().getParameters().get('accountId') != ''){
String accId = Apexpages.currentPage().getParameters().get('accountId');
for(Account acc : [Select id,New_Territory_crm__c, Name,Account_Type_ods__c,Methodolgy_crm__c
,Specialty_ods__c FROM Account Where id =:accId limit 1 ]){
nonPersonAccount = acc;
}

interaction = new Call_crm__c(Account_crm__r = nonPersonAccount );
}

if(stdCon.getId() != null){
for(Call_crm__c callcrm : [Select Territory_crm__c, Status_crm__c, Start_Date_Time_crm__c,
Call_Note_crm__c,Name, Meal_Expense_crm__c, Meal_Expense_Notes_crm__c,
Meal_Expense_Amount_crm__c, Id, End_Date_Time_crm__c,
Description_crm__c, All_Day_crm__c, Address_crm__c,
Actual_Attendees_crm__c, Account_crm__c,Completed_crm__c,Planned_Attendees_crm__c,
CreatedDate,
Account_crm__r.New_Territory_crm__c,
Account_crm__r.Name,Account_crm__r.Account_Type_ods__c,Next_Call_Strategy_crm__c,
Account_crm__r.Methodolgy_crm__c,Account_crm__r.Specialty_ods__c,
CreatedBy.Name,
Call_Report_Type_crm__c
From Call_crm__c
Where id =:stdCon.getId()]){
interaction = callcrm;
nonPersonAccount = interaction.Account_crm__r;
if(interaction.Start_Date_Time_crm__c != null){
contact.BirthDate = interaction.Start_Date_Time_crm__c.date();
timestamp = interaction.Start_Date_Time_crm__c.format('kk:mm',usr.TimeZoneSidKey);
system.debug('____________timestamp____________'+timestamp);
}
if ( interaction != null )
CreatedByInfo = interaction.createdby.name + ' ' + interaction.createdDate.date().format();
}
} else {
CreatedByInfo = UserInfo.getName();
if (nonPersonAccount.New_Territory_crm__c != null)
interaction.Territory_crm__c = nonPersonAccount.New_Territory_crm__c;
}


if(interaction.id != null){
getExistingCallProduct();
}


initliaze();

if(interaction.id != null){
getExistingData();
}
}

private void initliaze(){

/* commented on 03/05/2011
userTrs = new List<Selectoption>();
for(Territory terriotory :[Select Name, Id
From Territory
where id IN
(Select TerritoryId
From UserTerritory
where UserId =: UserInfo.getUserId()
)]){
userTrs.add(new Selectoption(terriotory.Name,terriotory.Name));
}
*/

followUpType = new List<SelectOption>();
for(Followup_Task_Type_crm__c followUpTask : [Select Name, Id, Home_Office_Tasks__c
From Followup_Task_Type_crm__c
order by Display_Order_crm__c asc]){
CallTask calltask = new CallTask(new Call_Task_crm__c(Followup_Task_Type_crm__r = followUpTask));
calltask.callTaskCrm.Followup_Task_Type_crm__c = followUpTask.id;
calltask.callTaskCrm.Subject_crm__c = followUpTask.Name;
calltask.callTaskCrm.Name = followUpTask.Name;
calltask.callTaskCrm.Home_Office_Task__c = followUpTask.Home_Office_Tasks__c;

existingCallTask.add(calltask);
existingCallTaskMap.put(followUpTask.id,calltask);
}
if(interaction.status_crm__c == null){
interaction.status_crm__c = 'In Office';
}

/* commented on 03/05/2011
if(userTrs.size()>0 && (interaction.id == null || interaction.Territory_crm__c == null)){
interaction.Territory_crm__c = userTrs[0].getValue();
}
*/

getAccountAffilcation();
getAddress();


//Prepare ProductLines
productLineInfos = new List<ProductLineInfo>();
List<Product_Line_crm__c> productLinecrms = [Select Name,Display_Caption_crm__c, Id From Product_Line_crm__c order by Display_Order_crm__c asc ];
Map<Id,ProductLineInfo> mapProductLinecrms = new Map<Id,ProductLineInfo>();
for(Product_Line_crm__c plc :productLinecrms ){
ProductLineInfo pli = new ProductLineInfo(plc);
productLineInfos.add(pli);
mapProductLinecrms.put(plc.id,pli);
}

for(Product_crm__c pc :[Select Product_Line_crm__c, Name, Id, Display_Order_crm__c
From Product_crm__c
Where Product_Line_crm__c IN :productLinecrms
order by Display_Order_crm__c asc ]){
mapProductLinecrms.get(pc.Product_Line_crm__c).addProducts(pc,existingCallProduct);
//mapProductLinecrms.get(pc.Product_Line_crm__c).listProductCrm.add(new ProductCrm(pc));
}
}



void getTimeStamp(){
timeList = new List<Selectoption>();
//timestamp = '';
Datetime currentDate = system.now();
timestamp = currentDate.format('kk', usr.TimeZoneSidKey) + ':00';

for(Integer i = 0 ; i< 12 ; i++){
for(Integer j = 0 ; j < 4 ; j++){
String hourValue = getFormattedString(i);
String minuteValue = getFormattedString((j * 15));
timeList.add( new Selectoption(hourValue + ':' + minuteValue, hourValue + ':' + minuteValue +' AM'));
}
}
for(Integer i = 0 ; i< 12 ; i++){
for(Integer j = 0 ; j < 4 ; j++){
String hourValue = getFormattedString(i);
if(i == 0){
hourValue = getFormattedString(i + 12);
}
String minuteValue = getFormattedString((j * 15));
timeList.add( new Selectoption((i+12).format() + ':' + minuteValue, hourValue + ':' + minuteValue +' PM'));
}
}
}

private String getFormattedString(Integer intValue){
if(String.valueOf(intValue).length() ==1){
return '0' + String.valueOf(intValue);
}
return String.valueOf(intValue);
}

void getAccountAffilcation(){
for(Affiliation_crm__c affiliation : [Select To_Account_crm__r.Type,
To_Account_crm__c,To_Account_crm__r.Name,Type_crm__c
From Affiliation_crm__c
Where Account_crm__c =:nonPersonAccount.id
and To_Account_crm__r.Account_Type_ods__c ='Provider'
]){
CallAttendee ca = new CallAttendee(affiliation);
listcallAttendee.add(ca);
mapCallAttendee.put(affiliation.To_Account_crm__c,ca);
}
system.debug('________listcallAttendee'+listcallAttendee);
}

void getAddress(){
listOfAddress = new List<Selectoption>();
for(Address_ods__c address : [Select Name,id
From Address_ods__c
Where Account_ods__c = :nonPersonAccount.id]){
listOfAddress.add(new Selectoption(address.id,address.Name));
}
}

public Pagereference save(){
Pagereference pg = null;


if(interaction.Meal_Expense_crm__c == true && (interaction.Meal_Expense_Amount_crm__c == null || interaction.Meal_Expense_Amount_crm__c == 0)){
Apexpages.addMessage( new ApexPages.Message(ApexPages.Severity.ERROR, 'Meal Expense Amount can not be zero'));
return null;
}else{

System.SavePoint sp = Database.setSavepoint();
try{
//Integer tstamp = Integer.valueOf(timestamp);

// guruk: use current user timezone
// interaction.Start_Date_Time_crm__c = Datetime.newInstanceGmt(contact.BirthDate,Time.newInstance(Integer.valueOf(timestamp.split(':')[0]), Integer.valueOf(timestamp.split(':')[1]), 0, 0));

interaction.Start_Date_Time_crm__c = Datetime.newInstance(contact.BirthDate,Time.newInstance(Integer.valueOf(timestamp.split(':')[0]), Integer.valueOf(timestamp.split(':')[1]), 0, 0));

interaction.End_Date_Time_crm__c = interaction.Start_Date_Time_crm__c.addMinutes(15);
interaction.Account_crm__c = nonPersonAccount.id;
interaction.Description_crm__c = '';
upsert interaction;

if(callPriceActivity.id == null){
callPriceActivity.Call_crm__c = interaction.id;
callPriceActivity.Account_crm__c = nonPersonAccount.id;
callPriceActivity.Name = nonPersonAccount.Name;
}

system.debug('---callPriceActivity--'+callPriceActivity);


/*
for(String s : attendees){
if(! existingCallAttendee.containsKey(s)){
callAttendees.add(new Ref_Call_Attendee_crm__c(Account_crm__c = s,Call_crm__c = interaction.id ));
}
existingCallAttendee.remove(s);
}
*/
system.debug('______________addedCallAttendee__'+addedCallAttendee);
List<Ref_Call_Attendee_crm__c> callAttendeesToDelete = new List<Ref_Call_Attendee_crm__c>();
List<Ref_Call_Attendee_crm__c> callAttendeesToInsert = new List<Ref_Call_Attendee_crm__c>();
for(CallAttendee ca : addedlistcallAttendee){
if(deletedCallAttendee.indexOf(ca.affiliationCrm.To_Account_crm__c) != -1){
callAttendeesToDelete.add(ca.refCallAttendee);
}
addedCallAttendee = addedCallAttendee.replace(ca.affiliationCrm.To_Account_crm__c, '');
}

for(CallAttendee ca : listcallAttendee){
if(addedCallAttendee.indexOf(ca.affiliationCrm.To_Account_crm__c) != -1){
callAttendeesToInsert.add(new Ref_Call_Attendee_crm__c(Account_crm__c = ca.affiliationCrm.To_Account_crm__c,Call_crm__c = interaction.id ));
}
}

List<Call_Task_crm__c> callTaskToInsert = new List<Call_Task_crm__c>();
List<Call_Task_crm__c> callTaskToDelete = new List<Call_Task_crm__c>();
for(CallTask calltask : existingCallTask){

Call_Task_crm__c calltaskcrm = calltask.callTaskCrm;

if(calltaskcrm.id == null){
calltaskcrm.Call_Crm__c =interaction.id;
calltaskcrm.Assigned_To_crm__c = Userinfo.getUserId();
}

// capture completed by guruk 3/5/2011

if ( calltaskcrm.datecompleted_crm__c != null &&
calltaskcrm.completed_by_crm__c == null ) {
calltaskcrm.completed_by_crm__c = Userinfo.getUserId();
}

if(calltaskcrm.Date_crm__c == null){
calltaskcrm.Date_crm__c = interaction.Start_Date_Time_crm__c.adddays(7).date();
}

if(calltask.isSelected){
// add account reference
calltaskcrm.account_crm__c = nonPersonAccount.id;
callTaskToInsert.add(calltaskcrm);
}else if(calltask.isSelected == false && calltaskcrm.id != null){
callTaskToDelete.add(calltaskcrm);
}

}

List<Call_Product_Detail_crm__c> callProductsToInsert = new List<Call_Product_Detail_crm__c>();
for(ProductLineInfo pli: productLineInfos){
for(String s : pli.selectedProductListLeft){
if(! existingCallProduct.containsKey(s)){
callProductsToInsert.add(new Call_Product_Detail_crm__c(
Product_Info_crm__c =s, Call_crm__c = interaction.id));
}
existingCallProduct.remove(s);
}

for(String s : pli.selectedProductListRight){
if(! existingCallProduct.containsKey(s)){
callProductsToInsert.add(new Call_Product_Detail_crm__c(
Product_Info_crm__c =s, Call_crm__c = interaction.id));
}

existingCallProduct.remove(s);
}
}

if(isProposalSelected == true){
upsert callPriceActivity;
}else if(isProposalSelected == false && callPriceActivity.id != null){
delete callPriceActivity;
}
//upsert callAttendees;
//delete existingCallAttendee.values();
upsert callTaskToInsert;
delete callTaskToDelete;
upsert callProductsToInsert;
delete existingCallProduct.values();
upsert callAttendeesToInsert;
delete callAttendeesToDelete;

//Select r.Call_crm__c, r.Account_crm__r.Name, r.Account_crm__c From Ref_Call_Attendee_crm__c r
//

String str= nonPersonAccount.Name;
for(Ref_Call_Attendee_crm__c refCalls : [select id,Name,Account_crm__r.Name from Ref_Call_Attendee_crm__c Where Call_crm__c =:interaction.id AND Account_crm__c <> null] ){
str += str == '' ? '' : ', ';
str += refCalls.Account_crm__r.Name;
}
interaction.description_crm__c = str;

String productString = '';
String productLine = '';
for(Call_Product_Detail_crm__c callProduct : [select Product_Info_crm__r.Display_Order_crm__c
,Product_Info_crm__r.Name,Product_Info_crm__r.Product_Line_crm__r.Name,Product_Info_crm__r.Product_Line_crm__r.Display_Caption_crm__c
FROM Call_Product_Detail_crm__c
Where Call_crm__c =:interaction.id AND Product_Info_crm__c <> null
Order by Product_Info_crm__r.Product_Line_crm__r.Display_Caption_crm__c asc,Product_Info_crm__r.Display_Order_crm__c asc] ){
if(productLine != callProduct.Product_Info_crm__r.Product_Line_crm__r.Name ){
productLine = callProduct.Product_Info_crm__r.Product_Line_crm__r.Name;
productString += productLine +': ';
}
productString += callProduct.Product_Info_crm__r.Name +',';
}
if(productString!= ''){
//productString.substring(0,productString.lenth);
productString = productString.substring(0,productString.length()-2) +'.';
}
interaction.Detailed_Products_crm__c = productString;

update interaction;
//sp.commit();

pg = new Pagereference('/' + nonPersonAccount.id);
isSaved = true;
}catch(Exception e){
Database.rollback(sp);
Apexpages.addMessages(e);
}
}
return pg;
}

private void getExistingData(){
//listCallTask = new List<CallTask>();
followuptaks = new List<String>();


for(Call_Task_crm__c ctcrm : [Select Followup_Task_Type_crm__c, Call_crm__c,Comments_crm__c,DateCompleted_crm__c
,Assigned_To_crm__c ,Followup_Task_Type_crm__r.Name,Date_crm__c,Subject_crm__c,
Completed_By_crm__c
From Call_Task_crm__c
Where Call_crm__c=: interaction.Id AND Followup_Task_Type_crm__c <> NULL]){
existingCallTaskMap.get(ctcrm.Followup_Task_Type_crm__c).setCallTask(ctcrm);

}

for(Ref_Call_Attendee_crm__c refCalls : [select id,Name,Account_crm__r.Name
from Ref_Call_Attendee_crm__c
Where Call_crm__c =:interaction.id]){
existingCallAttendee.put(refCalls.Account_crm__c,refCalls);
mapCallAttendee.get(refCalls.Account_crm__c).refCallAttendee = refCalls;
addedlistcallAttendee.add(mapCallAttendee.get(refCalls.Account_crm__c));
addedCallAttendee += ','+ refCalls.Account_crm__c;
mapCallAttendee.remove(refCalls.Account_crm__c);
}

listcallAttendee = mapCallAttendee.values();

for(Price_Quote_Activity_crm__c pqa : [Select Proposal_Action_crm__c, Name,
Date_Sent_crm__c, Date_Expired_crm__c, Date_Declined_crm__c,
Date_Accepted_crm__c, Call_crm__c, Account_crm__c
From Price_Quote_Activity_crm__c
Where Call_crm__c =:interaction.id limit 1]){
callPriceActivity = pqa;
isProposalSelected = true;
}

}



private void getExistingCallProduct(){
for(Call_Product_Detail_crm__c callProduct : [Select c.Product_Info_crm__c, c.Call_crm__c
From Call_Product_Detail_crm__c c
Where Call_crm__c =:interaction.id]){
existingCallProduct.put(callProduct.Product_Info_crm__c,callProduct);
}
}

public Pagereference cancel(){
return new Pagereference('/' + nonPersonAccount.id);
}

public class CallTask{
public Call_Task_crm__c callTaskCrm {get;set;}
public Boolean isSelected {get;set;}
public Boolean isAlreadySelected {get;set;}

public CallTask(Call_Task_crm__c callTaskCrm){
this.callTaskCrm = callTaskCrm;
}

public void setCallTask(Call_Task_crm__c callTaskCrm){
this.callTaskCrm = callTaskCrm;
this.isSelected = true;
this.isAlreadySelected = true;
}
}

public class CallAttendee{
public Ref_Call_Attendee_crm__c refCallAttendee {get;set;}
public Affiliation_crm__c affiliationCrm {get;set;}

public CallAttendee(Affiliation_crm__c affiliationCrm){
this.affiliationCrm = affiliationCrm;
this.refCallAttendee = null;
}
}

public class ProductLineInfo{
public Product_Line_crm__c productline {get;set;}
public List<Selectoption> productListleft {get;set;}
public List<Selectoption> productListRight {get;set;}
public Integer index ;
public List<String> selectedProductListLeft {get;set;}
public List<String> selectedProductListRight {get;set;}
//public List<ProductCrm> listProductCrm {get;set;}

public ProductLineInfo(Product_Line_crm__c productline ){
this.productline = productline;
//this.productList = productList;
this.productListleft = new List<SelectOption>();
this.productListRight = new List<SelectOption>();
this.selectedProductListLeft = new List<String>();
this.selectedProductListRight = new List<String>();
index = 0;
//this.listProductCrm = new List<ProductCrm>();
}

public void addProducts(Product_crm__c product,Map<String,Call_Product_Detail_crm__c> existingCallProduct){
if(Math.mod(index,2) == 0){
this.productListleft.add(new SelectOption(product.id,product.Name));
if(existingCallProduct.containsKey(product.id)){
this.selectedProductListLeft.add(product.id);
}
}else{
this.productListRight.add(new SelectOption(product.id,product.Name));
if(existingCallProduct.containsKey(product.id)){
this.selectedProductListRight.add(product.id);
}
}
index++;
}
}
}

Check all your SOQL there is one field that you are not querying and accessing it in VFP or in Controller

Like

 Account a = [Select id from Account limit 1];

String accName = a.Name;

in this example I did not query Name but accessed it.

If you could share the controller will be helpful to trace it.

That was it. Thank you soo much for your help.