Frown Error: Cannot perform interop call to (...) wrong arg[0]=extensions value

Hi,

I have a non-fatal error in PBI Desktop. I'm not sure when exactly it started occuring. The report is behaving normal. 

It refers to a table from a shared semantic model, other reports using the same semantic model are working fine. 

Don't know if it's related, but I have enabled the TMDL feature (.pbip) recently. 

I have no clue what the message means and can't seem to solve it. Any ideas? 

Thanks in advance!

1st part of the Error log: 

Feedback Type:
Frown (Error)

Error Message:
Cannot perform interop call to: exploreClientInteropHost_modelAuthoringDesktopHostService.UpdateModelExtensions(args:1) - wrong arg[0]=extensions value [
{
"name": "extension",
"entities": [
{
"name": "table_name",
"extends": "table_name"
}
]
}
]

Stack Trace:
Microsoft.PowerBI.Client.Windows.WebView2.WebView2Interop+InvokeCsException
at Microsoft.PowerBI.Client.Windows.WebView2.WebView2Interop.ConvertArgs(InteropCall call, MethodInfo method, IList`1 args)
at Microsoft.PowerBI.Client.Windows.WebView2.WebView2Interop.InvokeCsMethod(Object interopObj, MethodInfo method, InteropCall call)
at Microsoft.PowerBI.Client.Windows.WebView2.WebView2Interop.InvokeCs(InteropCall call)
at Microsoft.Mashup.Host.Document.ExceptionHandlerExtensions.HandleExceptions(IExceptionHandler exceptionHandler, Action action)