intermittent ditto error

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Richard Waite 11 posts 79 karma points

May 27, 2022 @ 15:54

Ditto Feedback

Umbraco 7

I'm getting this occasional intermittent error on a legacy Umbraco 7.15.6 site, using ditto 0.12.2. Any ideas??

System.NullReferenceException: Object reference not set to an instance of an object.
   at Our.Umbraco.Ditto.EnumerableConverterAttribute.ProcessValue()
   at Our.Umbraco.Ditto.DittoCacheableAttribute.GetCacheItem[TOuputType](DittoCacheContext cacheContext, Func`1 refresher)
   at Our.Umbraco.Ditto.PublishedContentExtensions.DoGetProcessedValue(IPublishedContent content, DittoTypePropertyInfo mappableProperty, DittoProcessorContext baseProcessorContext, DittoChainContext chainContext)
   at Our.Umbraco.Ditto.PublishedContentExtensions.GetProcessedValue(IPublishedContent content, CultureInfo culture, DittoTypeInfo config, DittoTypePropertyInfo mappableProperty, Object instance, DittoChainContext chainContext)
   at Our.Umbraco.Ditto.PublishedContentExtensions.ConvertContent(IPublishedContent content, DittoTypeInfo config, CultureInfo culture, Object instance, Action`1 onConverting, Action`1 onConverted, DittoChainContext chainContext)
   at Our.Umbraco.Ditto.PublishedContentExtensions.As(IPublishedContent content, Type type, CultureInfo culture, Object instance, IEnumerable`1 processorContexts, Action`1 onConverting, Action`1 onConverted, DittoChainContext chainContext)

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Lee Kelleher 4020 posts 15802 karma points MVP 13x admin c-trib

Jun 03, 2022 @ 08:07

0

Hi Richard,

It's been a few years since I worked on the Ditto library. Re-looking at the source code, I'm unsure what could be causing the intermittent error.

https://github.com/umco/umbraco-ditto/blob/0.12.2/src/Our.Umbraco.Ditto/ComponentModel/Processors/EnumerableConverterAttribute.cs#L35

My guess would be a concurrency caching bug - which had been mentioned before - but couldn't reproduce this at the time.

https://github.com/umco/umbraco-ditto/issues/249

Given that Ditto has now been retired/archived, I won't be doing any maintenance/patch releases. My best advice is to either identify the underlying issue and patch a custom fork of Ditto ... or to try to workaround or reduce Ditto's usage, e.g. manually mapping properties.

Sorry I don't have a better answer for you - but I didn't want to leave your post unanswered.

Cheers,
- Lee

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