‘Argument cannot be null’ error on renewal quote created programatically

[Vishala]

Question:

We are attempted to write an Apex class which will programmatically create a renewal quote. The quote is getting an ‘Argument cannot be null’ error when attempting to calculate the metrics.

What is the cause of this issue and how to resolve. 

[Vishala · Accepted solution]

Answer:

Upon rewieing  the debug logs for the renewal quote created  by Apex class.

It is throwing error with below stack trace

10:22:45.970 (5022674109)|USER_DEBUG|[23]|DEBUG|Error while processing preview results: Class.zqu.MetricObjectBuilderFactory.RenewalMetricObjectBuilder.createQCS: line 246, column 1
Class.zqu.MetricObjectBuilderFactory.BaseMetricObjectBuilder.createMetricObjects: line 178, column 1

Engineering team have confirmed this as bug that this issue will be addressed in future release and no ETA on it. 
Jira Reference for this issue  COM-13243.

Workaround suggested  to remove the field value for zquProductRatePlanCharge_c on Quotechargesummary then refresh the quote, which should calculate the metrics again without error.​