Hi Everyone,

There is an apex code that throws an exception 'System.ListException: List index out of bounds: 0
Class.NewEventsBudget.<init>: line 14, column 1' .

This exception occurs only in the sandbox and is working completely fine in production. I have pasted the code below. Line marked in bold is line 14 of the code. Can some body please help me with this? 


This is the code:
   public class NewEventsBudget {
    public Events_Budget__c eventBudget {get; set;}
    public Order order {get; set;}
    public List<selectOption> suppliers {get; set;}
    
    public string newSectionType {get; set;}
    public boolean isSalesforce {get; set;}
    
    public List<WrapperMainSection> wmainSectionList {get;set;}
    public NewEventsBudget(ApexPages.StandardController stdController){
        this.eventBudget = (Events_Budget__c)stdController.getRecord(); 
        Id proEventId = apexpages.currentpage().getparameters().get('peid');
        
        order = [select Id,Job_Number__c,Project_Name__c,Name from Order where id = :proEventId][0];
        eventBudget.Project_Event_Number__c = order.Id;
        eventBudget.Conversion_Rate__c = 1.0;
        string jobNumber = order.Job_Number__c;
        wmainSectionList = new List <WrapperMainSection>();
        suppliers = new List<selectOption>();
        suppliers.add(new SelectOption('','-'));
        for(Account a : [select name,RecordType.Name, id from Account where RecordType.Name = 'IE Supplier' order by Name]){
            suppliers.add(new selectOption(a.Name, a.Name)); 
        }

Thanks,
Nazneen