Sitecore Commerce - Fix for Index rebuild failure

While rebuilding the web index for the commerce instance which contained a number of categories and sellable items,

We got the below error -

Exception: System.NullReferenceExceptionMessage: Object reference not set to an instance of an object.Source:
 Sitecore.Commerce.Engine.Connectat Sitecore.Commerce.Engine.Connect.Search.Crawlers.CatalogCrawlerBase`1.<>c__DisplayClass52_1.
b__0(CommerceCatalogIndexableItem indexable, ParallelLoopState loopState)

Fix - 

Open the content editor update the data commerce template and clearing the cache, this will fix the index rebuild issue.