Chrome: widgets.js:2 Uncaught TypeError: Cannot read property '0' of undefined

Marija Jemuovic
Member since: 2010


In all environments in Chrome only, I get the following behavior:

I start drag&dropping images to TinyMCE field and after around 5/6/7 images, I get an error in _checkAcceptance:

It doesn't matter which images I add (it's not related to the particular image, since I just add three from the same folder over and over again).

This is where it breaks:

Any ideas?

My Episerver packages:


Thx in advance!

#151827 Edited, Aug 08, 2016 13:39
  • Marija Jemuovic
    Member since: 2010

    I have upgraded to latest UI packages, but still that same error (it's 100% reproducible):

      <package id="EPiServer.CMS.UI" version="9.8.3" targetFramework="net452" />
      <package id="EPiServer.CMS.UI.Core" version="9.8.3" targetFramework="net452" />


    #151832 Aug 08, 2016 14:04
  • Muhammad Kashif
    Member since: 2005

    Thanks Marija for raising those. Hopefully episerver will show the love soon. On a separate note after upgrading to the latest version we been seeing a very slow response in edit mode while switching between pages and switiching to all properties. Did you also notice any difference? I've a feeling episerver has changed something fundamentally in new version which has slow down the edit?

    #151877 Aug 09, 2016 14:35


    I've reported a bug specifically for this issue since it seems its easy to reproduce.
    Thanks for providing detail info. 

    #151910 Aug 10, 2016 10:26
  • Marija Jemuovic
    Member since: 2010

    Hi, Khurram,

    Thx a lot, hopefully it will be easy for support to reproduce in their environments. Let me know if I can further assist with this.

    @Muhammad, I am not sure I've notice a performance downgrade. It's not exceptionally fast (not too bad either), but I can't tell if it's slower than it used to be.

    I can copy paste the issues from client perspective:

    "Navigation and asset pane tend to freeze. Drag & drop options (e.g. pictures from asset pane into page) work only a few times, then don't react anymore. After reload they work for a while before one of them freezes up again.

    I myself have encountered this at least 10 times yesterday and today while working in edit mode for several hours each day. And the same has been reported from all regions in the last days."



    #151912 Aug 10, 2016 10:30
  • Marija Jemuovic
    Member since: 2010

    I can reproduce this:

    - in local IIS

    - in test server IIS (standard setup, one server, VPP folder for images, etc)

    - Azure (with one and multiple instances)

    But, I cannot reproduce it in IIS express (I'll keep trying and get back, it doesn't look like it's a coincidence, but if I manage to reproduce it, i'll write back here).

    #151914 Aug 10, 2016 10:45
  • Ben  McKernan
    Member since: 2009

    Hey Marija,

    I've been looking into this bug and I have not been able to reproduce it. I've looked throught the code quite thoroughly and it seems to me that this scenario should not be able to occur. Also the code should fail a lot earlier if the argument "nodes" is undefined.

    Are you testing on a standard Alloy template site or are you testing with a customer site? I ask this since the only scenario I can think of where this might happen is if an add-on or custom code is interfering somehow.

    #152055 Aug 15, 2016 11:26
  • Marija Jemuovic
    Member since: 2010

    It's not a standard Alloy tech, it's a customer site.

    Do you think I should look into js files (if some of them are causing the conflict), perhaps try not to render any of them and then give this a try?

    #152056 Aug 15, 2016 11:30
  • Marija Jemuovic
    Member since: 2010

    Out of packages, I don't think I have anything that is likely to cause this, maybe Forms only?

    <?xml version="1.0" encoding="utf-8"?>
      <package id="AntiXSS" version="4.3.0" targetFramework="net452" />
      <package id="Antlr" version="" targetFramework="net452" />
      <package id="AutoMapper" version="3.2.1" targetFramework="net452" />
      <package id="Bower" version="" targetFramework="net452" />
      <package id="Castle.Core" version="3.3.3" targetFramework="net452" />
      <package id="Castle.Windsor" version="3.3.0" targetFramework="net452" />
      <package id="Chief2moro.ImageDataExtensions" version="" targetFramework="net452" />
      <package id="CommonServiceLocator" version="1.3" targetFramework="net452" />
      <package id="dotless" version="" targetFramework="net452" />
      <package id="EntityFramework" version="6.1.1" targetFramework="net452" />
      <package id="EPiServer.Azure" version="9.0.1" targetFramework="net452" />
      <package id="EPiServer.CMS" version="9.10.2" targetFramework="net452" />
      <package id="EPiServer.CMS.Core" version="9.10.2" targetFramework="net452" />
      <package id="EPiServer.CMS.UI" version="9.7.1" targetFramework="net452" />
      <package id="EPiServer.CMS.UI.Core" version="9.7.1" targetFramework="net452" />
      <package id="EPiServer.Forms" version="" targetFramework="net452" />
      <package id="EPiServer.Framework" version="9.10.2" targetFramework="net452" />
      <package id="EPiServer.GoogleAnalytics" version="" targetFramework="net452" />
      <package id="EPiServer.Logging.Log4Net" version="2.0.0" targetFramework="net452" />
      <package id="EPiServer.Packaging" version="3.2.4" targetFramework="net452" />
      <package id="EPiServer.Packaging.UI" version="3.2.4" targetFramework="net452" />
      <package id="EPiServer.Search" version="8.0.0" targetFramework="net452" />
      <package id="Grunt" version="0.1.13" targetFramework="net452" />
      <package id="HtmlAgilityPack" version="1.4.9" targetFramework="net452" />
      <package id="jQuery" version="1.6.4" targetFramework="net452" />
      <package id="log4net" version="2.0.3" targetFramework="net452" />
      <package id="Lucene.Net" version="3.0.3" targetFramework="net452" />
      <package id="Microsoft.AspNet.Identity.Core" version="2.2.1" targetFramework="net452" />
      <package id="Microsoft.AspNet.Identity.EntityFramework" version="2.2.1" targetFramework="net452" />
      <package id="Microsoft.AspNet.Identity.Owin" version="2.2.1" targetFramework="net452" />
      <package id="Microsoft.AspNet.Mvc" version="5.2.3" targetFramework="net452" />
      <package id="Microsoft.AspNet.Providers.Core" version="2.0.0" targetFramework="net452" />
      <package id="Microsoft.AspNet.Razor" version="3.2.3" targetFramework="net452" />
      <package id="Microsoft.AspNet.Web.Optimization" version="1.1.3" targetFramework="net452" />
      <package id="Microsoft.AspNet.WebApi" version="5.1.2" targetFramework="net452" />
      <package id="Microsoft.AspNet.WebApi.Client" version="5.1.2" targetFramework="net452" />
      <package id="Microsoft.AspNet.WebApi.Core" version="5.1.2" targetFramework="net452" />
      <package id="Microsoft.AspNet.WebApi.WebHost" version="5.1.2" targetFramework="net452" />
      <package id="Microsoft.AspNet.WebPages" version="3.2.3" targetFramework="net452" />
      <package id="Microsoft.Azure.KeyVault.Core" version="1.0.0" targetFramework="net452" />
      <package id="Microsoft.Bcl" version="1.1.10" targetFramework="net452" />
      <package id="Microsoft.Bcl.Async" version="1.0.168" targetFramework="net452" />
      <package id="Microsoft.Bcl.Build" version="1.0.21" targetFramework="net452" />
      <package id="Microsoft.Data.Edm" version="5.6.4" targetFramework="net452" />
      <package id="Microsoft.Data.OData" version="5.6.4" targetFramework="net452" />
      <package id="Microsoft.Data.Services.Client" version="5.6.4" targetFramework="net452" />
      <package id="Microsoft.Net.Http" version="2.2.29" targetFramework="net452" />
      <package id="Microsoft.Owin" version="3.0.1" targetFramework="net452" />
      <package id="Microsoft.Owin.Host.SystemWeb" version="3.0.1" targetFramework="net452" />
      <package id="Microsoft.Owin.Security" version="3.0.1" targetFramework="net452" />
      <package id="Microsoft.Owin.Security.Cookies" version="3.0.1" targetFramework="net452" />
      <package id="Microsoft.Owin.Security.OAuth" version="3.0.1" targetFramework="net452" />
      <package id="Microsoft.Web.Infrastructure" version="" targetFramework="net452" />
      <package id="Microsoft.Web.RedisSessionStateProvider" version="2.1.0" targetFramework="net452" />
      <package id="Microsoft.WindowsAzure.ConfigurationManager" version="3.1.0" targetFramework="net452" />
      <package id="Modernizr" version="2.6.2" targetFramework="net452" />
      <package id="Newtonsoft.Json" version="6.0.8" targetFramework="net452" />
      <package id="Node.js" version="" targetFramework="net452" />
      <package id="NoGit" version="0.0.5" targetFramework="net452" />
      <package id="Npm" version="1.4.4" targetFramework="net452" />
      <package id="NuGet.Core" version="2.5.0" targetFramework="net452" />
      <package id="Owin" version="1.0" targetFramework="net452" />
      <package id="PagedList" version="" targetFramework="net452" />
      <package id="PagedList.Mvc" version="" targetFramework="net452" />
      <package id="SharpZipLib" version="0.86.0" targetFramework="net452" />
      <package id="StackExchange.Redis.StrongName" version="1.0.488" targetFramework="net452" />
      <package id="structuremap.web-signed" version="" targetFramework="net452" />
      <package id="structuremap-signed" version="" targetFramework="net452" />
      <package id="System.Spatial" version="5.6.4" targetFramework="net452" />
      <package id="WebActivator" version="1.5.1" targetFramework="net452" />
      <package id="WebGrease" version="1.5.2" targetFramework="net452" />
      <package id="WindowsAzure.ServiceBus" version="3.0.7" targetFramework="net452" />
      <package id="WindowsAzure.Storage" version="6.1.0" targetFramework="net452" />

    P.S. I also have Projects enabled, but it doesn't matter if there is a selected project or not.

    #152057 Edited, Aug 15, 2016 11:33
  • Ben  McKernan
    Member since: 2009
    <p>I also thought Forms might be the culprit but I have just done some testing with that add-on installed and have still not been able to reproduce the issue. Of course it may depend on what properties are on the page in order to determine what scripts get loaded.</p> <p>A quick fix would be to simply add an undefined check where the code fails for you, but this would not be fixing the cause of the issue since it should not be able to get into this state.</p>
    #152061 Aug 15, 2016 12:43