How to fix : Object reference not set to an instance of an object?

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Posted on by Jamal JEK

Hi, i am using ParentId to retrieve only the records of the current account of a customer address in a plugin,

it worked fine when the plugin was triggered on the create of a customer address, but when i tried it in update i get the error :

Error of Plugin: System.NullReferenceException: Object reference not set to an instance of an object. can anyone help ?

                        var addresstype = entity.GetAttributeValue("addresstypecode").Value;
                        tracingService.Trace("Addresstype value = "   addresstype);
                        var accountid = entity.GetAttributeValue("parentid").Id;
                        tracingService.Trace("ACcount value = "   accountid);
                        QueryExpression query = new QueryExpression("customeraddress");
                        query.ColumnSet = new ColumnSet("addresstypecode");
                        query.Criteria.FilterOperator = LogicalOperator.And;
                        query.Criteria.AddCondition("addresstypecode", ConditionOperator.Equal, addresstype);
                        query.Criteria.AddCondition("parentid", ConditionOperator.Equal, accountid);
                        EntityCollection collection = service.RetrieveMultiple(query);

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Pankaj Gogoi 3,177 on at

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Which line is throwing the error? You are trying to get Value from an object that is null. Either addresstypecode or parentid is null.

On update the entity will contain only the modified values being modified in the current pipeline.

You can use PostEntityImages

https://docs.microsoft.com/en-us/powerapps/developer/common-data-service/register-plug-in#types-of-entity-images

https://community.dynamics.com/crm/b/thinkdynamicdodynamic/posts/pre-image-and-post-image-in-dynamics-crm

Best Regards

PG

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Jamal JEK 35 on at

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Thank you Pankaj for your reply

The line 3 is the one is throwing the error

var accountid = entity.GetAttributeValue<EntityReference>("parentid").Id;

I need to compare the addresstypecode of the updated record and the addresstypecode of the others records, not the addresstypecode of the updated and the old record

Best Regards

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Pankaj Gogoi 3,177 on at

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Hi Jamal,

Since parentid field is not updated, it will not be part of the Target Entity. You can us a retrieve operatio to fetch the parentid of the current record but this will be an additional load or you can register a pre-image with the update plugin registration process, and you don't need to call retieve and you can get attribute value from pre-entity.

var preEntity = (Entity)context.PreEntityImages[preimagename];

Best Regards

PG

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Bipin D365 28,985 Moderator on at

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Hi,

You should always check null condition even for create message.

var accountid=Guid.Empty();

EntityReference erfparentid=entity.GetAttributeValue<EntityReference>("parentid");

if(erfparentid!=null)

{

accountid=erfparentid.Id;

}

Add below logic only when MessageName is update because your existing code is already working for create.

As suggested by Pankaj, you can register image for update stage.

But, you should first check if Target has this field data then use that if not take value from image.

If you directly take value from image, and if use update this field on form you will only get old value not latest value.

Please mark my answer verified if i were helpful

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