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Form On Load event throwing error on addOnProcessStatusChange method call

I have added the following JavaScript to a Case form to launch the resolve case dialog when a user completes the last step of the business process flow:

function onLoad(executionContext) {
var formContext = executionContext.getFormContext();

formContext.data.process.addOnProcessStatusChange(onFinishBPF);
}

function onFinishBPF(executionContext){
var formContext = executionContext.getFormContext();
var status = formContext.data.process.getStatus();
if (status === "finished") {
CrmService.IncidentRibbon.CommandBarActions.resolve();
}
}

Very infrequently, we get this script error when a user opens the form:

Cannot read properties of null (reading 'setValue')

Event Name: onload

Function Name: onLoad

Unfortunately it happens infrequently enough that I haven't been able to replicate it while debugging to identify where the error is occurring. So I'm not sure if the problem is with executionContext being null or a problem with calling the addOnProcessStatusChange() method. Since it only happens occasionally, I suspect that sometimes the onLoad function is getting called before everything is actually completed loading.

I DO have the "Pass execution context as first parameter" option selected in the event configuration.

Any suggestions would be greatly appreciated.

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