Can't batch update variants in variant group

After batch editing the variants in a particular variant group (through BatchEditArticle.aspx) I receive the following error when pressing Save:

The URL-encoded form data is not valid.

at System.Web.HttpRequest.FillInFormCollection()
at System.Web.HttpRequest.EnsureForm()
at System.Web.HttpRequest.get_Form()
at System.Web.HttpRequest.get_HasForm()
at System.Web.UI.Page.GetCollectionBasedOnMethod(Boolean dontReturnNull)
at System.Web.UI.Page.DeterminePostBackMode()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

No errors in log file. What might be the problem? Invalid variant data?
The error occurs even if no data was actually changed in the batch editing view.

Litium version: 4.8.10

I can not see any obvious error from this, did you solve the issue already?

The issue was solved by increasing the appsetting “aspnet:MaxHttpCollectionKeys” in web.config.

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