EditForm url is not correct .Possible SharePoint bug.

Hello

I have asset library, In this asset library I have custom content type. This custom content type has EditFormUrl.(copy from out of the box page)
But when page EditFormUrl opens error throws, because in incoming URL there is two "List" parameter.
For example:

http://server/sites/SiteCollectionForVideoUploadDemo/_layouts/15/Intergation/ApplicationPage2Edit.aspx
?List=d741e711%2D7f88%2D49ea%2Da818%2D25a10b48526e
&RootFolder=%2Fsites%2FSiteCollectionForVideoUploadDemo%2Ftest7
&ID=17
&ContentTypeId=0x0120D520A808003E483E712D86497495E6529931D825C4005F90B0AC6BE15B4EA599D4120C492F26
&List=%7Bd741e711%2D7f88%2D49ea%2Da818%2D25a10b48526e%7D
&NewVS=1&Source=http%3A%2F%2Flab%2Dws8%2D34%2Fsites%2FSiteCollectionForVideoUploadDemo%2Ftest7%2FForms%2FThumbnails%2Easpx%3FRootFolder%3D%252Fsites%252FSiteCollectionForVideoUploadDemo%252Ftest7
&Web=e1bc134d%2D3588%2D4046%2D9ddf%2D95b9449438c8

error in URL log:
System.NullReferenceException: Object reference not set to an instance of an object.    at Microsoft.Office.DocumentManagement.Pages.EditVideoSet.AddListFormWebPart()     at Microsoft.Office.DocumentManagement.Pages.EditVideoSet.OnInit(EventArgs e)     at System.Web.UI.Control.InitRecursive(Control namingContainer)     at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)eaff799c-9c5b-f0ab-e8ef-4a92b2869e48

Can you give advice, why do I have two List parameters in URL. Is this share point bug?