Exception when answering assigned questions in Expert part of Rel

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Invalid use of read only object - Clone() it before making modifications.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: EPiServer.Common.Exceptions.FrameworkException: Invalid use of read only object - Clone() it before making modifications.

Source Error:

 An unhandled exception was generated during the execution of the current  web request. Information regarding the origin and location of the  exception can be identified using the exception stack trace below.

Stack Trace:

[FrameworkException: Invalid use of read only object - Clone() it before making modifications.]
   EPiServer.Common.EntityValidator.ValidateIsNotReadOnly(ICloneable cloneable) +111
   EPiServer.Common.Data.FrameworkFactoryBase.UpdateEntity(IFrameworkEntity entity, Int32 id, Boolean add) +117
   EPiServer.Common.Data.FrameworkFactoryBase.UpdateEntity(IFrameworkEntity entity) +63
   EPiServer.Community.Expert.Data.ExpertFactory.UpdateAssignedQuestion(AssignedQuestion assignedQuestion) +282

[FrameworkException: Could not update assigned question with ID 24.]
   EPiServer.Community.Expert.Data.ExpertFactory.UpdateAssignedQuestion(AssignedQuestion assignedQuestion) +534
   EPiServer.Community.Expert.Data.ExpertFactory.SetAssignedQuestionTopic(AssignedQuestion aq) +792
   EPiServer.Community.Expert.Data.ExpertFactory.SetAssignedQuestionForumEntities(AssignedQuestion aq) +23
   EPiServer.Community.Expert.Data.ExpertFactory.AddAnswer(Answer answer) +541

[FrameworkException: Could not add answer.]
   EPiServer.Community.Expert.Data.ExpertFactory.AddAnswer(Answer answer) +712
   EPiServer.Community.Expert.ExpertHandler.AddAnswer(Answer answer) +37
   EPiServer.Community.Web.Administration.AnswerInfoControl.buttonSave_Click(Object sender, EventArgs e) +925
   System.Web.UI.WebControls.Button.OnClick(EventArgs e) +103
   System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +140
   System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +32
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3103

Version Information: Microsoft .NET Framework Version:2.0.50727.3603; ASP.NET Version:2.0.50727.4049

The problem also seem to appear when we assign a certain forum room to an expert, and when removing this assignment. Is this a known bug for which there is a hotfix?

Best regards

Martin

Exception when answering assigned questions in Expert part of Relate+

Server Error in '/' Application.

Invalid use of read only object - Clone() it before making modifications.