Error Closing Email Template Form

I've found a problem when closing the email template form if a user doesn't have write permissions to the entity. The following error is thrown, which suggests that it's a problem with a missing toolbar:

<CrmScriptErrorReport>

 <ReportVersion>1.0</ReportVersion>

 <ScriptErrorDetails>

  <Message>'_htmlBarComponent' is null or not an object</Message>

  <Line>405</Line>

  <URL>/tools/emailtemplateeditor/emailtemplateeditor.aspx?id=%7bB6C38BB9-2423-471D-8B38-E3B99ED80E7A%7d</URL>

  <PageURL>/tools/emailtemplateeditor/emailtemplateeditor.aspx?id=%7bB6C38BB9-2423-471D-8B38-E3B99ED80E7A%7d</PageURL>

  <Function>EmailTemplateEditorOnLoad()</Function>

  <CallStack>

   <Function>EmailTemplateEditorOnLoad()</Function>

   <Function>anonymous(c,d){for(varb=0,e=a.length;b<e;b++)a[b](c,d)}</Function>

   <Function>anonymous(){varb=this.get_events().getHandler("load"),a=newSys.ApplicationLoadEventArgs(Array.clone(this._createdComponents),!!this._loaded);this._loaded=true;if(b)b(this,a);if(window.pageLoad)window.pageLoad(this,a);this._createdComponents=[]}</Function>

   <Function>anonymous(){if(!this.get_isInitialized()&&!this._disposing){Sys._Application.callBaseMethod(this,"initialize");this._raiseInit();if(this.get_stateString){if(Sys.WebForms&&Sys.WebForms.PageRequestManager){this._beginRequestHandler=Function.createDelegate(this,this._onPageRequestManagerBeginRequest);Sys.WebForms.PageRequestManager.getInstance().add_beginRequest(this._beginRequestHandler);this._endRequestHandler=Function.createDelegate(this,this._onPageRequestManagerEndRequest);Sys.WebForms.PageRequestManager.getInstance().add_endRequest(this._endRequestHandler)}vara=this.get_stateString();if(a!==this._currentEntry)this._navigate(a);elsethis._ensureHistory()}this.raiseLoad()}}</Function>

   <Function>b()</Function>

   <Function>anonymous(){Sys.UI.DomEvent.removeHandler(window,"load",c);b()}</Function>

   <Function>anonymous(){varb={};try{b=Sys.UI.DomElement._getWindow(a).event}catch(c){}returne.call(a,newSys.UI.DomEvent(b))}</Function>

  </CallStack>

 </ScriptErrorDetails>

 <ClientInformation>

  <BrowserUserAgent>Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; .NET4.0C; .NET4.0E; InfoPath.2; Tablet PC 2.0)</BrowserUserAgent>

  <BrowserLanguage>en-us</BrowserLanguage>

  <SystemLanguage>en-gb</SystemLanguage>

  <UserLanguage>en-gb</UserLanguage>

  <ScreenResolution>1680x1050</ScreenResolution>

  <ClientName>Web</ClientName>

  <ClientTime>2013-08-29T15:38:20</ClientTime>

 </ClientInformation>

 <ServerInformation>

   <OrgLanguage>1033</OrgLanguage>

   <OrgCulture>1036</OrgCulture>

   <UserLanguage>1033</UserLanguage>

   <UserCulture>1036</UserCulture>

   <OrgID>{3CB1AB35-43ED-E211-8636-005056BA7EB1}</OrgID>

   <UserID>{4AC8BBEF-8CEF-E211-9672-005056BA7A2B}</UserID>

   <CRMVersion>5.0.9690.3448</CRMVersion>

 </ServerInformation>

</CrmScriptErrorReport>