JavaScript: Object reference not set to an instance of an object

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The script was created using Rawish Kumars example. It fails with the general error "Internal Server Error." From debugger mode, "req:XMLHttpRequest: response" indicates the error is "Object reference not set to an instance of an object".

**** Begin of script

function VPNApplicable_Opt() {
debugger;

    var fieldValueToCopy = Xrm.Page.getAttribute("new_2vpnapplicable").getValue();
    var lookupObj = Xrm.Page.getAttribute("objectid").getValue();
    var newid = lookupObj[0].id.slice(1, -1); // you will get perfect id like "EDCJDKDJDKJDJDKJDJKD" here.

    var req = new XMLHttpRequest();
    /*
    var primaryProjectId;
    EntityReference primaryProjectId = new EntityReference ("msdyn_projects", newid);
    console.log(primaryProjectId);

    queueitem["primaryProjectId"] = primaryProjectId;
    */
    req.open("PATCH", Xrm.Page.context.getClientUrl() + "/api/data/v9.0/msdyn_projects(" + newid + ")?$select=new_2vpnapplicable$expand=msdyn_project_QueueItems($select=objectid)", true);
    /*
    var url = Xrm.Page.context.getClientUrl() + "/api/data/v9.0/msdyn_projects(" + newid + ")?$select=new_2vpnapplicable, projectid$expand=msdyn_project_QueueItems($select=objectid)";
    console.log(url);
    req.open("GET", url, true);
    */
    req.setRequestHeader("OData-MaxVersion", "4.0");
    req.setRequestHeader("OData-Version", "4.0");
    req.setRequestHeader("Accept", "application/json");
    req.setRequestHeader("Content-Type", "application/json; charset=utf-8");
    req.setRequestHeader("Prefer", "odata.include-annotations=\"*\"");
    req.onreadystatechange = function () {
        if (this.readyState === 4) {
            req.onreadystatechange = null;
            if (this.status === 200) {
                var result = JSON.parse(this.response); // you will get the retrieved value in object we stored in result var.

                var retrivedvalue = result.new_2vpnapplicable; //get the id of the field
                //var retrivedformatedvalue = result["new_2vpnapplicable@OData.Community.Display.V1.FormattedValue"]; //get the formatted name of the field
                if (retrivedvalue != null) {
                    var value = new Array();
                    value[0] = new Object();
                    value[0].id = retrivedvalue;
                    //value[0].name = retrivedformatedvalue;
                    value[0].entityType = "msdyn_projects";
                    // console.log(value[0]);
                    Xrm.Page.get

Attribute("new_2vpnapplicable").setValue(fieldValueToCopy); //set the lookup value finally
                } else
                    alert("some textt!!!!!!") // optional
            } else {
                Xrm.Utility.alertDialog(this.statusText);
            }
        }
    };
    req.send();
}

****** End of script

I tested the URL and got the desired results:

*** URL results

@odata.context "xxxxxxxxxxxxxxxx.crm.dynamics.com/.../v9.0$metadata#msdyn_projects(new_2vpnapplicable)/$entity"

@odata.etag "W/\"17715491\""

new_2vpnapplicable 100000001

msdyn_projectid "089cc620-95c8-e711-8119-e0071b6a5d41"

**** end link

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a33ik 84,331 Most Valuable Professional on at

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Hello,

It's a bit hard to go through your code and find an error when system is not available. And the code is not the easiest one. I would highly recommend to master JavaScript troubleshooting - docs.microsoft.com/.../debug-javascript-code

I understand that it's time investment but believe me - it'll help you in future.

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RaviKashyap 55,410 Moderator on at

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Based on the error message, I suspect some internal plugin is triggering which is causing this issue. I would suggest to try the same action i.e. set the same value to the same project record from UI and see if it works. If you get the same error then investigate/ troubleshoot that first.

Also, in your script, you are setting the same value in the lookup which you have retrieved so worth check that piece of code.

Hope this helps.

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Community Member on at

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Hello Ravi,

Thank you for your recommendation, though I do not understand it - "set the same value to the same project record from UI."

The script is depicted above, can you inform me as to what line(s) of code need to be changed?

Thank you,

Lannie

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RaviKashyap 55,410 Moderator on at

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Hi Lannie,

I need to you do the same thing directly in CRM which you are doing with the script. So if you are setting a lookup field values, try to set the same value in CRM manually and see if it works.

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Community Member on at

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Hello Ravi,

Affirmative, I can manually change the field "new_2vpnapplicable" in Project.
I modified the script since the last posting, it is below:

********************** Script begin **************

function VPNApplicable_Opt() {
debugger;
    var fieldValueToCopy = Xrm.Page.getAttribute("new_2vpnapplicable").getValue();
   var lookupObj = Xrm.Page.getAttribute("objectid").getValue();
    var newid = lookupObj[0].id.slice(1, -1);     // you will get perfect id like "EDCJDKDJDKJDJDKJDJKD" here.
    var req = new XMLHttpRequest();

   req.open("PATCH", Xrm.Page.context.getClientUrl() + "/api/data/v9.0/msdyn_projects(" + newid + ")?$select=new_2vpnapplicable", true);
    /*
   var url = Xrm.Page.context.getClientUrl() + "/api/data/v9.0/msdyn_projects(" + newid + ")?$select=new_2vpnapplicable";
   console.log(url);
   req.open("GET", url, true);
    */
   req.setRequestHeader("OData-MaxVersion", "4.0");
    req.setRequestHeader("OData-Version", "4.0");
    req.setRequestHeader("Accept", "application/json");
    req.setRequestHeader("Content-Type", "application/json; charset=utf-8");
    req.setRequestHeader("Prefer", "odata.include-annotations=\"*\"");
    req.onreadystatechange = function () {
        if (this.readyState === 4) {
            req.onreadystatechange = null;
            if (this.status === 200) {
                var result = JSON.parse(this.response); // you will get the retrieved value in object we stored in result var.

                var retrivedvalue = result.new_2vpnapplicable; //get the id of the field
                //var retrivedformatedvalue = result["new_2vpnapplicable@OData.Community.Display.V1.FormattedValue"]; //get the formatted name of the field
                if (retrivedvalue != null) {
                    var value = new Array();
                    value[0] = new Object();
                    value[0].id = retrivedvalue;
                    //value[0].name = retrivedformatedvalue;
                    value[0].entityType = "msdyn_projects";
                   // console.log(value[0]);
                    Xrm.Page.getAttribute("new_2vpnapplicable").setValue(fieldValueToCopy); //set the lookup value finally
                } else
                    alert("some textt!!!!!!") // optional
            } else {
                Xrm.Utility.alertDialog(this.statusText);
            }
        }
    };
    req.send();
}

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RaviKashyap 55,410 Moderator on at

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What error you are getting now with this script? And what exactly you are trying with script? Are you using it to update threcord using WEB API or retrieve a record from web api and populate in the form? Asking because you are using PATCH instead of GET as opposed to what is used in the example here community.dynamics.com/.../get-lookup-value-from-other-entity-and-set-it-on-the-form-using-web-api-in-microsoft-dynamics-crm

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Community Member on at

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The alert pop-up states "Internal Server Error." Using debugger, the value of "response:" is:

response: "{\"error\":{\"code\":\"0x0\",\"message\":\"Object reference not set to an instance of an object.\",\"innererror\":{\"message\":\"Object reference not set to an instance of an object.\",\"type\":\"System.NullReferenceException\",\"stacktrace\":\" at Microsoft.Crm.Extensibility.OData.CrmODataUtilities.ValidatePatchInputProperties(EdmEntityObject entityDelta, CrmODataExecutionContext crmODataExecutionContext)\\r\\n at Microsoft.Crm.Extensibility.OData.EntityController.PatchEntityImplementation(String& entityName, String key, EdmEntityObject entityDelta)\\r\\n at Microsoft.PowerApps.CoreFramework.ActivityLoggerExtensions.Execute[TResult](ILogger logger, EventId eventId, ActivityType activityType, Func`1 func, IEnumerable`1 additionalCustomProperties)\\r\\n at Microsoft.Xrm.Telemetry.XrmTelemetryExtensions.Execute[TResult](ILogger logger, XrmTelemetryActivityType activityType, Func`1 func)\\r\\n at lambda_method(Closure , Object , Object[] )\\r\\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass10.<GetExecutor>b__9(Object instance, Object[] methodParameters)\\r\\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)\\r\\n--- End of stack trace from previous location where exception was thrown ---\\r\\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\\r\\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\\r\\n at System.Web.Http.Controllers.ApiControllerActionInvoker.<InvokeActionAsyncCore>d__0.MoveNext()\\r\\n--- End of stack trace from previous location where exception was thrown ---\\r\\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\\r\\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\\r\\n at System.Web.Http.Controllers.ActionFilterResult.<ExecuteAsync>d__2.MoveNext()\\r\\n--- End of stack trace from previous location where exception was thrown ---\\r\\n at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()\\r\\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\\r\\n at System.Web.Http.Dispatcher.HttpControllerDispatcher.<SendAsync>d__1.MoveNext()\"}}}"

*** end of response

Task:

I am retrieving the value of an option field (new_2vpnapplicable) in Queue Items and populating a field in Projects with the same name and type. I am using "PATCH" because I was following an example by Rawish Kumar - https://community.dynamics.com/crm/b/passiondynamics/archive/2018/01/13/get-lookup-value-from-other-entity-and-set-it-on-the-form-using-web-api-in-microsoft-dynamics-crm

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Community Member on at

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Using GET instead of PATCH resolved the problem.

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