Broken variants, object reference not set error.

When creating a variant of a project I'm suddenly getting a 'Object reference not set to an instance of an object.' error.

Full error:

[NullReferenceException: Object reference not set to an instance of an object.]
   Dynamicweb.Caching.DictionaryCache`2.GetCacheResult(IEnumerable`1 keys) +214
   Dynamicweb.Caching.ServiceCache`2.GetCache(IEnumerable`1 keys) +142
   Dynamicweb.Ecommerce.VariantOptionService.GetByGroupAndLanguage(String languageId, String variantGroupId, Boolean showUntranslated) +230
   Dynamicweb.Admin.eComBackend._Closure$__._Lambda$__58-0(VariantGroup g) +13
   System.Linq.WhereListIterator`1.MoveNext() +80
   Dynamicweb.Admin.eComBackend.EcomProductVariants.ShowVariantCombinations() +434
   Dynamicweb.Admin.eComBackend.EcomProductVariants.ShowVariantGroupList() +3054
   Dynamicweb.Admin.eComBackend.EcomProductVariants.Page_Load(Object sender, EventArgs e) +825
   System.Web.UI.Control.OnLoad(EventArgs e) +105
   System.Web.UI.Control.LoadRecursive() +67
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3784

When selecting the specfic variant in the Ecommerce configuration i'm running into the same error..
Any tips on how to proceed?

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Broken variants, object reference not set error.

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