intermittent ditto error

Press Ctrl / CMD + C to copy this to your clipboard.

Copied to clipboard

Flag this post as spam?

This post will be reported to the moderators as potential spam to be looked at

Richard Waite 11 posts 79 karma points

May 27, 2022 @ 15:54

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)

Copy Link

Lee Kelleher 4026 posts 15836 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

Copy Link
is working on a reply...

Please Sign in or register to post replies