I was having the same problem few days ago.
I have changed the DNN library source code to avoid this error.
Basically, I changed the Library/UI/Utilities/ClientAPI.vb
add if condition check to line 155
If Not objButton.Page.IsPostBack Then
DotNetNuke.UI.Utilities.ClientAPI.RegisterClientReference(objButton.Page, DotNetNuke.UI.Utilities.ClientAPI.ClientNamespaceReferences.dnn_dom)
End If
add if condition check to line 357
If Not objPage.IsPostBack Then
ClientAPI.GetCallbackEventReference(objPage, "", "", "", "")
End If
Meanwhile, you may also need to disable the DNN default navigation(use RadMenu would be fine) , SolPartActions and dnnVISIBILITY in container.
I am still testing if my code change breaks anything else, but so far, it seems working fine.
Cheers,